| Language | Reflex(es) | Gloss | Grammar | Sources |
|---|
| English |
| English | Eastfarthing | Shire quadrant in Tolkien: The Lord of the Rings | prop.n | LRC |
| English | quadricentenary | fourth centennial; re: 400 years | n | AHD LRC |
| English | cadre | frame, framework | n | AHD W7 LRC |
| English | cahier | report/memorial concerning parliamentary policy | n | AHD W7 LRC |
| English | carillon | fixed bells rung by hammers controlled by keyboard | n | AHD W7 LRC |
| English | carnet | official pass/permit, customs document | n | AHD LRC |
| English | casern | military barracks/garrison | n | AHD LRC |
| English | cater-cornered | diagonal; set diagonally | adj | AHD CDC LRC |
| English | czardas | intricate Hungarian dance | n | AHD LRC |
| English | diatessaron | harmony of four Gospels edited/arranged into single connected narrative | n | AHD W7 LRC |
| English | escadrille | unit of European air force containing 6 airplanes | n | AHD W7 LRC |
| English | Farthing | Shire quadrant in Tolkien: The Lord of the Rings | prop.n | LRC |
| English | farthing | British monetary unit (1/4 penny) | n | AHD W7 LRC |
| English | forty | 40 | nbr.card | AHD W7 LRC |
| English | four | 4 | nbr.card | AHD W7 LRC |
| English | fourfold | quadruple, 4 times the number/quantity | adj | LRC |
| English | fourth | 4th | nbr.ord | AHD W7 LRC |
| English | Northfarthing | Shire quadrant in Tolkien: The Lord of the Rings | prop.n | LRC |
| English | quadrant | quarter | n | AHD W7 LRC |
| English | quadrate | being (approximately) square | adj | AHD W7 LRC |
| English | quadri- | four | pfx | AHD W7 LRC |
| English | quadrille | 4-handed card game | n | AHD W7 LRC |
| English | quadroon | person of 1/4 black African ancestry | n | AHD W7 LRC |
| English | quadrumanous | four-handed, having four feet with with opposable first digits | adj | AHD CDC LRC |
| English | quarantine | period of 40 days | n | AHD W7 LRC |
| English | quarrel | square-headed bolt/arrow esp. for crossbow | n | AHD W7 LRC |
| English | quarry | open excavation for obtaining stone/slate for construction | n | AHD W7 LRC |
| English | quart | unit of volume (1/4 of a gallon) | n | AHD W7 LRC |
| English | quartan | occurring every 4th day | adj | AHD W7 LRC |
| English | quarter | 1/4 part | n | AHD W7 LRC |
| English | quarter | to divide into four (nearly) equal parts | vb | W7 LRC |
| English | quarters | lodgings, living accommodations | n.pl | W9 LRC |
| English | quartet | group of four | n | W7 LRC |
| English | quarto | 1/4 of full sheet of paper | n | AHD W7 LRC |
| English | quaternary | quadruple, re: 4 units/members | adj | AHD W7 LRC |
| English | quaternion | tetrad, 4 parts/things/persons | n | AHD W7 LRC |
| English | quatrain | 4 lines of verse | n | AHD W7 LRC |
| English | quire | 24/25 sheets of paper in same size/quality: 1/20 ream | n | AHD W7 LRC |
| English | Southfarthing | Shire quadrant in Tolkien: The Lord of the Rings | prop.n | LRC |
| English | squad | small organized military group | n | AHD W7 LRC |
| English | square | tool with 2 straight edges at 90 degree angle | n | AHD W7 LRC |
| English | tessera | small wood/bone/ivory tablet used as ticket, voucher, etc. | n | AHD W7 LRC |
| English | tetra- | four | pfx | AHD W7 LRC |
| English | tetrad | group/arrangement of four | n | AHD W7 LRC |
| English | tetrahedron | polyhedron of four faces | n | AHD W7 LRC |
| English | trocar | pointed metal instrument fitted with cannula | n | AHD W7 LRC |
| English | Westfarthing | Shire quadrant in Tolkien: The Lord of the Rings | prop.n | LRC |
| Old English | fēowertig | forty (40) | nbr.card | GED LRC |
| Old English | fēorðung | farthing, quarter (1/4) | n.fem | ASD LRC |
| Old English | fēower(e) | four (4) | nbr.card | W7 ASD LRC |
| Old English | fēowertȳne | fourteen (14) | nbr.card | GED LRC |
| Old English | fēo(we)rða | fourth (4th) | nbr.ord | W7 ASD LRC |
| Middle English | diatessaron | diatessaron | n | W7 LRC |
| Middle English | ferthing | farthing | n | W7 LRC |
| Middle English | four | four (4) | nbr.card | W7 LRC |
| Middle English | fourty | forty (40) | nbr.card | W7 LRC |
| Middle English | quadrant | quadrant | n | W7 LRC |
| Middle English | quadrate | quadrate | adj | W7 LRC |
| Middle English | quadri- | quadri- | pfx | W7 LRC |
| Middle English | quair | four paper sheets folded together once | n | W7 LRC |
| Middle English | quarey | quarry | n | W7 LRC |
| Middle English | quarrel | quarrel | n | W7 LRC |
| Middle English | quarrere | quarry | n | W7 LRC |
| Middle English | quart | quart | n | W7 LRC |
| Middle English | quarter | quarter | n | W7 LRC |
| Middle English | quarteyne | quartan | adj | W7 LRC |
| Middle English | quaternyoun | quaternion | n | W7 LRC |
| Middle English | square | square | n | W7 LRC |
| Middle English | tetra- | tetra- | pfx | W7 LRC |
| West Germanic |
| Old Frisian | fiortig | forty (40) | nbr.card | GED LRC |
| Old Frisian | fiuwertich | forty (40) | nbr.card | GED LRC |
| Old Frisian | fio(we)r, fiuwer | four (4) | nbr.card | ASD LRC |
| Old Frisian | fiūwertīne | fourteen (14) | nbr.card | GED LRC |
| Frisian | fjouver | four (4) | nbr.card | ASD LRC |
| Old High German | fiorzug | forty (40) | nbr.card | GED LRC |
| German | vierzehn | fourteen (14) | nbr.card | LRC |
| Old High German | fior | four (4) | nbr.card | W7 LRC |
| Old High German | fiordo | fourth (4th) | nbr.ord | EIE LRC |
| Old High German | fiorzehan | fourteen (14) | nbr.card | GED LRC |
| Middle High German | vier | four (4) | nbr.card | ASD LRC |
| Middle High German | vierdunc | 1/4 part | n | W7 LRC |
| German | Kaserne | quarters, barracks | n | TLL LRC |
| German | vier | four (4) | nbr.card | ASD LRC |
| German | vierzig | forty (40) | nbr.card | LRC |
| Dutch | kazerne | quarters, barracks | n | TLL LRC |
| Dutch | vier | four (4) | nbr.card | ASD LRC |
| Old Saxon | fi(u)war, fior | four (4) | nbr.card | ASD LRC |
| Low German | veer | four (4) | nbr.card | ASD LRC |
| East Germanic |
| Gothic | *fidwor-tigjus | forty (40) | nbr.card | GED LRC |
| Crimean Gothic | *fiirdeiþien, furdei-thien | forty (40), lit. fourth ten | nbr.card | CGo GED LRC |
| Gothic | fidwor | four (4) | nbr.card | ASD LRC |
| Gothic | fidwor-taihun | fourteen (14) | nbr.card | GED LRC |
| Crimean Gothic | fyder | four (4) | nbr.card | EIE LRC |
| Hellenic |
| Greek | τεσσεράκοντα | forty (40) | nbr.card | GED LRC |
| Ionic | τέταρτος | fourth | nbr.ord | LRC |
| Homeric Greek | τέσσαρες | four (4) | nbr.card | EIE LRC |
| Attic | τέταρτος | fourth | nbr.ord | LRC |
| Attic | τέτταρες | four (4) | nbr.card | EIE LRC |
| Greek | tetra- | four | pfx | W7 LRC |
| Greek | tetras, tetrados | group of four | n.fem | W7 LRC |
| Greek | τέτρατος | fourth (4th) | nbr.ord | EIE LRC |
| Mycenaean | θε-το-ρο-πι | four (4) | nbr.card | LRC |
| Doric | τέτορες | four (4) | nbr.card | EIE LRC |
| Boeotian | πέτταρες | four (4) | nbr.card | EIE LRC |
| Lesbian | πέσυρες | four (4) | nbr.card | EIE LRC |
| Celtic |
| Old Irish | cethair | four (4) | nbr.card | EIE LRC |
| Irish | ceathair | four (4) | nbr.card | LRC |
| Scots Gaelic | ceithir | four (4) | nbr.card | LRC |
| Manx | kiare | four (4) | nbr.card | LRC |
| Old Welsh | petguar | four (4) | nbr.card | EIE LRC |
| Welsh | pedwar | four (4) | nbr.card | ASD LRC |
| North Germanic |
| Old Norse | fjōrði | fourth (4th) | nbr.ord | EIE LRC |
| Old Norse | fjórðung | 1/4 part of land area | n | LRC |
| Old Norse | fjōrir | four (4) | nbr.card | EIE LRC |
| Old Icelandic | fjōrir-tiger | forty (40) | nbr.card | GED LRC |
| Old Icelandic | fjōrtān | fourteen (14) | nbr.card | GED LRC |
| Icelandic | fjōrir | four (4) | nbr.card | ASD LRC |
| Danish | fire | four (4) | nbr.card | ASD LRC |
| Danish | kasern | quarters, barracks | n | TLL LRC |
| Swedish | fyre | four (4) | nbr.card | ASD LRC |
| Swedish | kasern | quarters, barracks | n | TLL LRC |
| Italic |
| Oscan | petora | four (4) | nbr.card | EIE LRC |
| Latin | quadra- | four (4) | pfx | W7 LRC |
| Latin | quadraginta | forty (40) | nbr | W7 LRC |
| Latin | quadrans, quadrantis | quadrant | n.masc | W7 LRC |
| Latin | quadrō, quadrāre, quadrāvī, quadrātus | to make square | vb | W7 LRC |
| Latin | quadrum | square | n.neut | W7 LRC |
| Latin | quartanus | of the fourth | adj | W7 LRC |
| Latin | quartarius | of a fourth | adj | W7 LRC |
| Latin | quartus | fourth (4th) | adj | W7 LRC |
| Latin | quaternarius | in fourth position | adj | W7 LRC |
| Latin | quaterni | four each, set of four | adv | W7 LRC |
| Latin | quattuor | four (4) | nbr.card | LRC |
| Latin | tessera | tessera, rectangular tablet | n.fem | W7 LRC |
| Latin | tetra- | four | pfx | W7 LRC |
| Vulgar Latin | exquadra | square | n.fem | W7 LRC |
| Vulgar Latin | exquadro, exquadrāre | to make square | vb | W7 LRC |
| Vulgar Latin | exquadro, exquadrāre | to square | vb | W7 LRC |
| Vulgar Latin | quadernum | booklet | n.neut | W7 LRC |
| Vulgar Latin | quadrellum | square | n.neut | W7 LRC |
| Late Latin | quaternio, quaternionis | set of four | n.masc | W7 LRC |
| Old Spanish | escuadra | squad | n.fem | W7 LRC |
| Spanish | cuarterón | a fourth | adj | W7 LRC |
| Spanish | cuarto | fourth | adj | W7 LRC |
| Spanish | escuadra | squad, squadron | n.fem | W7 LRC |
| Spanish | escuadrilla | squadron | n.fem.dim | W7 LRC |
| Old French | quarantaine | period of forty days | n.fem | W7 LRC |
| Old French | quarante | forty | nbr | W7 LRC |
| Old French | quare | squared stone | n.fem | W7 LRC |
| Old French | quarregnon | carillon | n.masc | W7 LRC |
| Old French | quarrel | square-headed arrow, building stone | n.masc | W7 LRC |
| Old French | quart, quarte | fourth | adj | W7 LRC |
| Old French | quartaine | quartan fever | n.fem | W7 LRC |
| Old French | quartier | a fourth, quarter | n.masc | W7 LRC |
| Middle French | esquade | squad | n.fem | W7 LRC |
| Middle French | esquarre | square | n.fem | W7 LRC |
| Middle French | quaer, caier | four sheets of paper folded once | n.masc | W7 LRC |
| Middle French | quarantaine | period of fourty days | n.fem | W7 LRC |
| Middle French | quarrel | square of glass | n.masc | W7 LRC |
| Middle French | quarrière | quarry | n.fem | W7 LRC |
| Middle French | quarte | quart, fourth musical note | n.fem | W7 LRC |
| Middle French | quatrain | quatrain | n.masc | W7 LRC |
| Middle French | quatre | four | nbr | W7 LRC |
| French | cadre | frame | n.masc | W7 LRC |
| French | cahier | book, school-book | n.masc | W7 LRC |
| French | carillon | chime | n.masc | W7 R1 LRC |
| French | carrer | to make square | vb | W7 LRC |
| French | caserne | quarters, barracks | n | LRC |
| French | escadrille | squadron | n.fem | W7 LRC |
| French | quadrille | type of dance | n.masc | W7 LRC |
| French | quatrain | quatrain | n.masc | W7 LRC |
| French | trocart | trocar | n.masc | W7 LRC |
| Old Italian | squadra | square | n.masc | W7 LRC |
| Old Italian | squatrare | to quarter | vb | LRC |
| Italian | quadro | picture, painting | n.masc | W7 LRC |
| Italian | quarantina | set of forty | n.fem | W7 LRC |
| Italian | squartare | to quarter | vb | LRC |
| Balto-Slavic |
| Old Prussian | kettwirts | fourth (4th) | nbr.ord | EIE LRC |
| Lithuanian | keturì | four (4) | nbr.card | EIE LRC |
| Lithuanian | ketverì | quartet | n | EIE LRC |
| Lithuanian | ketvir̃as | fourth (4th) | nbr.ord | EIE LRC |
| Latvian | cętur̃tais | fourth (4th) | nbr.ord | EIE LRC |
| Latvian | četri | four (4) | nbr.card | EIE LRC |
| Russian | c̬etvërtyj | fourth (4th) | nbr.ord | EIE LRC |
| Serbo-Croatian | čardāk | watchtower | n | AHD LRC |
| Old Church Slavonic | četverĭ | quartet | n | EIE LRC |
| Old Church Slavonic | četvrĭtŭ | fourth (4th) | nbr.ord | EIE LRC |
| Old Church Slavonic | četyre | four (4) | nbr.card | EIE LRC |
| Paleo-Balkan |
| Albanian | katër | four (4) | nbr.card | EIE LRC |
| Albanian | katërt | fourth (4th) | nbr.card | EIE LRC |
| Armenian |
| Armenian | č'ork' | four (4) | nbr.card | EIE LRC |
| Indo-Iranian |
| Avestan | čaθru- | fourth (4th) | nbr.ord | EIE LRC |
| Avestan | čaθwārō | four (4) | nbr.card | EIE LRC |
| Sanskrit | caturthá- | fourth (4th) | nbr.ord | EIE LRC |
| Sanskrit | catvā́ra, catúra- | four (4) | nbr.card | EIE LRC |
| Tocharian |
| Tocharian B | śtarte | fourth (4th) | nbr.ord | EIE LRC |
| Tocharian B | śtwer | four (4) | nbr.card | EIE LRC |
| Tocharian A | śtärt | fourth (4th) | nbr.ord | EIE LRC |
| Tocharian A | śtwar | four (4) | nbr.card | EIE LRC |