| Language | Reflex(es) | Gloss | Grammar | Sources |
|---|
| Celtic |
| Welsh | dal(a) | to hold | vb | GED LRC |
| English |
| Old English | andlang | along | prep | W7 ASD LRC |
| Old English | lang | long | adj | LRC |
| Old English | langian | to long, yearn | vb | W7 LRC |
| Old English | lengan | to lengthen, prolong | vb.wk | W7 ASD LRC |
| Old English | len(g)ten, lencten | Lent | n.masc | W7 ASD LRC |
| Old English | lengþu | length | n | W7 LRC |
| Old English | tulge, tylg | rather | adv | GED LRC |
| Middle English | along | along | adv | W7 LRC |
| Middle English | belongen | to belong | vb | W7 LRC |
| Middle English | eloynen | to eloign | vb | W7 LRC |
| Middle English | lang | long | adj | W7 LRC |
| Middle English | lengen | to prolong | vb | W7 LRC |
| Middle English | lengeren | to dwell | vb.freq | W7 LRC |
| Middle English | lengthe | length | n | W7 LRC |
| Middle English | lente | springtime, Lent | n | W7 LRC |
| Middle English | ling | ling (fish) | n | W7 LRC |
| Middle English | long | long | adj | W7 LRC |
| Middle English | longen | to be suitable | vb | W7 LRC |
| Middle English | longitude | longitude | n | W7 LRC |
| Middle English | Lumbarde | Lombard | prop.n | W7 LRC |
| Middle English | oblong | oblong | adj | W7 LRC |
| Middle English | prolongen | to prolong | vb | W7 LRC |
| Middle English | purloinen | to put away, render ineffectual | vb | W7 LRC |
| English | along | in same direction, in line parallel with length | adv | AHD W7 LRC |
| English | belong | to be suitable/appropriate/advantageous | vb.intrans | AHD W7 LRC |
| English | dolichocephalic | re: relatively long head | adj | AHD W7 LRC |
| English | dolichocranial | having relatively long skull | adj | AHD LRC |
| English | eloign | to remove to distant/unknown place | vb.trans | AHD W7 LRC |
| English | elongate | to extend in length | vb | AHD W7 LRC |
| English | indulge | to give free choice to | vb | AHD W7 LRC |
| English | Langstrand | Gondor coast in Tolkien: The Lord of the Rings | prop.n | LRC |
| English | length | longer/longest dimension of object | n | AHD W7 LRC |
| English | Lent | Christian period of penitence before Easter | prop.n | LRC |
| English | ling | fish in cod family | n | AHD W7 LRC |
| English | linger | to tarry, be slow to leave | vb | AHD W7 LRC |
| English | Lombard | member of Teutonic peoples who invaded/settled N. Italy in 568 A.D. | prop.n | AHD W7 LRC |
| English | long | extending for significant distance | adj | AHD W7 LRC |
| English | long | to yearn, feel strong desire/craving | vb.intrans | AHD W7 LRC |
| English | longeron | major fore-aft structural member of aircraft fuselage | n | AHD LRC |
| English | longhorn | Texas cattle breed | n | LRC |
| English | longitude | length | n | AHD W7 LRC |
| English | Longshanks | epithet for Strider in Tolkien: The Lord of the Rings | prop.n | LRC |
| English | longshore | re: seacoast location | adj | AHD LRC |
| English | lounge | public waiting room | n | AHD LRC |
| English | lunge | sudden forward thrust/movement | n | AHD LRC |
| English | oblong | deviating from square/circular shape through elongation | adj | AHD W7 LRC |
| English | prolong | to continue, lengthen in time | vb.trans | AHD W7 LRC |
| English | purloin | to filch, appropriate wrongfully | vb | AHD W7 LRC |
| West Germanic |
| Dutch | langs | along | prep | TLL LRC |
| Dutch | leng | ling (fish) | n | W7 LRC |
| Old Saxon | tulgo | very | adv | GED LRC |
| Old High German | lang | long | adj | W7 LRC |
| Old High German | langēn | to long | vb | W7 LRC |
| Old High German | lengiz, lenzo | Lent, spring | n | ASD LRC |
| Old High German | lengjan | to lengthen, prolong | vb | ASD LRC |
| Old High German | lenzin | spring | n | W7 LRC |
| German | lang | long | adj | LRC |
| German | Länge | length | n.fem | TLL LRC |
| German | längs | along | prep | TLL LRC |
| German | Lenz | Lent, spring | n.masc | ASD LRC |
| German | verlängern | to lengthen | vb | LRC |
| North Germanic |
| Icelandic | lengja | to lengthen, prolong | vb | ASD LRC |
| Danish | langs | along | prep | TLL LRC |
| Swedish | längs | along | prep | TLL LRC |
| East Germanic |
| Gothic | ga-tulgjan | to fortify | vb.wk.I | GED LRC |
| Gothic | tulgiþa | firmness, certainty; safety, stronghold | n | GED ASD LRC |
| Gothic | tulgjan | to confirm, fortify | vb.wk.I | GED ASD LRC |
| Gothic | tulgus | firm, steady, steadfast | adj | GED LRC |
| Italic |
| Latin | indulgeo, indulgēre | to indulge, grant as a favor | vb | GED LRC |
| Latin | Langobardus | Longobard | n.masc | W7 LRC |
| Latin | longe | by far | adv | LRC |
| Latin | longitudo, longitudinis | length | n.fem | W7 LRC |
| Latin | longus | long | adj | W7 LRC |
| Latin | oblongus | oblong | adj | W7 LRC |
| Late Latin | ēlongo, ēlongāre, ēlongāvī, ēlongātus | to make long | vb | W7 LRC |
| Late Latin | prolongo, prolongāre | to prolong | vb | W7 LRC |
| New Latin | dolich- | spear | pfx | W7 LRC |
| New Latin | dolichocephalus | dolichocephalic | adj | W7 LRC |
| Portuguese | longo | long | adj | TLL LRC |
| Old French | esloigner | to put further away, to scare away | vb | W7 LRC |
| Old French | loing | far, at a distance | adv | W7 LRC |
| Old French | porloigner | to delay, put off | vb | W7 LRC |
| Anglo-French | purloigner | to delay, put off | vb | W7 LRC |
| Middle French | lombard | Lombard | adj | W7 LRC |
| Middle French | prolonguer | to prolong | vb | W7 LRC |
| French | allonger | to extend, prolong, lengthen; lay down | vb | AHD LRC |
| French | alongier | to extend, prolong, lengthen; lay down | vb | AHD LRC |
| French | éloigner | to scare away, put further away | vb | W7 LRC |
| French | long | long | adj | TLL LRC |
| Old Italian | lombardo | Lombard | adj | W7 LRC |
| Italian | lungo | long; along | adj | TLL LRC |
| Balto-Slavic |
| Lithuanian | ìlgas, ilgà | long | adj | LRC |
| Latvian | ilgi | long, for a long time | adj | LRC |
| Old Church Slavonic | dlъgъ | long | adj | GED RPN LRC |
| Old Church Slavonic | dlъžǫ, dlъžiti | to extend | vb | RPN LRC |
| Hellenic |
| Greek | δολιχός | long | adj | GED LRC |
| Greek | ἐνδελεχής | perpetual, continuous | adj | GED RPN LRC |
| Anatolian |
| Hittite | da-lu-ga-aš-ti | length | n | GED RPN LRC |
| Hittite | da-lu-ga-e-eš | long | adj | RPN LRC |
| Hittite | ta-lu-ki-(i)š-zi | to become long | vb.3.sg | RPN LRC |
| Indo-Iranian |
| Old Persian | darga- | long | adj | GED LRC |
| Avestan | darəgō | long | adj | GED LRC |
| Avestan | drājō | length | n | GED LRC |
| Sanskrit | dīrghá-ḥ | long, tall, deep | adj | GED RPN LRC |
| Sanskrit | drā́ghate | to stretch, lengthen | vb | GED RPN LRC |
| Sanskrit | drāgh(i)mān | length | n | RPN LRC |