| Language | Reflex(es) | Gloss | Grammar | Sources |
|---|
| English |
| English | septennial | (happening) every 7 years | adj | AHD W7 LRC |
| English | Heptateuch | first 7 books of Hebrew Bible, lit. seven containers | prop.n | LRC |
| English | septuple | having 7 units/members | adj | AHD LRC |
| English | hebdomad | group of seven | n | AHD W7 LRC |
| English | hept(a)- | seven | pfx | AHD LRC |
| English | heptad | group of seven | n | AHD W7 LRC |
| English | September | 9th month (in Gregorian calendar) | prop.n | AHD W7 LRC |
| English | septet | music for 7 voices/instruments | n | AHD W7 LRC |
| English | seven | 7 | nbr.card | AHD W7 LRC |
| English | seventh | 7th | nbr.ord | LRC |
| English | seventy | 70 | nbr.card | AHD W7 LRC |
| Old English | hundseofontig | hundred seventy (170) | nbr.card | W7 LRC |
| Old English | seofon, syfon | seven (7) | nbr.card | W7 ASD LRC |
| Old English | seofontig | seventy (70) | nbr.card | W7 LRC |
| Old English | siofþa, siofoða | seventh (7th) | nbr.ord | EIE LRC |
| Middle English | Septembre | September | prop.n | W7 LRC |
| Middle English | seven | seven | nbr.card | W7 LRC |
| Middle English | seventy | seventy | nbr.card | W7 LRC |
| Celtic |
| Old Irish | secht | seven (7) | nbr.card | EIE LRC |
| Old Irish | sechtmad | seventh (7th) | nbr.ord | EIE LRC |
| Irish | seacht | seven (7) | nbr.card | LRC |
| Scots Gaelic | seachd | seven (7) | nbr.card | LRC |
| Manx | shiaght | seven (7) | nbr.card | LRC |
| Middle Welsh | seith | seven (7) | nbr.card | EIE LRC |
| Welsh | seithfed | seventh (7th) | nbr.ord | EIE LRC |
| West Germanic |
| Old Frisian | saven, sigun | seven (7) | nbr.card | LRC |
| Old Saxon | siƀun | seven (7) | nbr.card | LRC |
| Old High German | sibun | seven | nbr.card | W7 LRC |
| Old High German | sibunto | seventh (7th) | nbr.ord | EIE LRC |
| German | September | September | prop.n | LRC |
| German | Septett | septet | n.neut | W7 LRC |
| German | sieben | seven (7) | nbr.card | LRC |
| German | siebter | seventh (7th) | nbr.ord | LRC |
| German | siebzig | seventy (70) | nbr.card | LRC |
| North Germanic |
| Old Norse | sjō | seven (7) | nbr.card | EIE LRC |
| Old Norse | sjōndi | seventh (7th) | nbr.ord | EIE LRC |
| Icelandic | sjau | seven (7) | nbr.card | LRC |
| Swedish | sju | seven (7) | nbr.card | TLL LRC |
| East Germanic |
| Gothic | sibun | seven | nbr.card | LRC |
| Crimean Gothic | *sevene, seuene | seven (7) | nbr.card | CGo LRC |
| Italic |
| Latin | septem | seven | nbr.card | W7 LRC |
| Latin | September | September, seventh month (in Roman calendar) | prop.n.masc | W7 LRC |
| Latin | septimus | seventh (7th) | nbr.ord | EIE LRC |
| Portuguese | sete | seven (7) | nbr.card | TLL LRC |
| Spanish | siete | seven (7) | nbr.card | TLL LRC |
| Old French | Septembre | September | n.masc | W7 LRC |
| French | sept | seven (7) | nbr.card | TLL LRC |
| Italian | sette | seven (7) | nbr.card | TLL LRC |
| Balto-Slavic |
| Old Prussian | sepmas | seventh (7th) | nbr.ord | EIE LRC |
| Lithuanian | septiñtas, septintà | seventh (7th) | nbr.ord | LRC |
| Lithuanian | septynì | seven (7) | nbr.card | EIE LRC |
| Latvian | septîtais | seventh (7th) | nbr.ord | EIE LRC |
| Russian | semĭ | seven (7) | nbr.card | EIE LRC |
| Old Church Slavonic | sedmĭ | seven (7) | nbr.card | EIE LRC |
| Old Church Slavonic | sedmyi, sedmoje, sedmaja | seventh (7th) | nbr.ord | LRC |
| Paleo-Balkan |
| Albanian | sh(ë)tatë | seven (7) | nbr.card | EIE LRC |
| Albanian | shtatë | seventh (7th) | nbr.ord | EIE LRC |
| Hellenic |
| Homeric Greek | ἑβδόματος, ἕβδομος | seventh (7th) | nbr.ord | LRC |
| Homeric Greek | ἑπτά | seven (7) | nbr.card | LRC |
| Homeric Greek | ἕπταχα | in seven parts | adj | LRC |
| Greek | hebdomas | (group of) seven | n.fem | W7 LRC |
| Greek | heptad- | group of seven | stem | W7 LRC |
| Greek | heptas | group of seven | n.fem | W7 LRC |
| Anatolian |
| Hittite | sapta- | seventh (7th) | pfx.ord | EIE LRC |
| Hittite | sipta- | seven (7) | nbr.card | EIE LRC |
| Armenian |
| Armenian | ewt'n | seven (7) | nbr.card | EIE LRC |
| Indo-Iranian |
| Middle Persian | haftom | seventh (7th) | nbr.ord | EIE LRC |
| Avestan | hapta | seven (7) | nbr.card | EIE LRC |
| Avestan | haptaθa- | seventh (7th) | nbr.ord | EIE LRC |
| Sanskrit | saptá | seven (7) | nbr.card | EIE LRC |
| Sanskrit | saptamá-, saptátha- | seventh (7th) | nbr.ord | EIE LRC |
| Tocharian |
| Tocharian B | ṣukt | seven (7) | nbr.card | EIE LRC |
| Tocharian B | ṣuktante | seventh (7th) | nbr.ord | EIE LRC |
| Tocharian A | ṣäptänt | seventh (7th) | nbr.ord | EIE LRC |
| Tocharian A | ṣpät | seven (7) | nbr.card | EIE LRC |