Words for thirty and related things in Celtic languages.


Proto-Celtic *trīkontes = thirty
Gaulish tricontis = thirty
Old Irish (Goídelc) trícha [ˈtʲrʲiːxo] = thirty
tríchatmad = thirtieth
tríchtaige = thirty day period
Middle Irish (Gaoidhealg) trícha, triúcha, tricha, triocha, tricho = thirty
tríchatmad, trichatmad, trichadmadh = thirtieth
tríchtaige, trichtaigi = period of 30 days/years, etc
tríchtach, tríteach = thirty-fold, consisting of 30
trícha cét = a military force, political or terrirtorial unit; of force of fighting men, cantred, barony (lit. ‘300’)
Irish (Gaeilge) tríocha = thirty
tríochadú = thirtieth
na tríochaidí = the thirties
tríocha céad = large territorial division, barony
Scottish Gaelic (Gàidhlig) trichead [triçəd] = thirty
tritheadamh (30ᵐʰ) = thirtieth (30ᵗʰ)
na tritheadan = the thirties
Manx (Gaelg) treead = thirty
Proto-Brythonic *trigont = thirty
Old Breton tricont, trigont = thirty
Middle Breton (Brezonec) tregont = thirty
tregontad = about thirty
tregontet, tregontvedenn, tregontvet = thirtieth
tregontkementiñ, tregontvedenniñ = to multiply by thirty
tregontvloaziad = a period of 30 years
Breton (Brezhoneg) tregont [ˈtreːɡɔ̃n(t)] = thirty
tregontved = thirtieth
tregontvedenn = thirtieth part
tragontad = around thirty

Etymology: from Proto-Indo-European *tridḱómt (thirty) from *tri- (three) and *déḱm̥ (ten) [source].

Words from the same roots include thirty in English, tridhjetë (thirty) in Albanian, երեսուն [jɛɾɛˈsun] (thirty) in Armenian, trenta (thirty) in Italian and trente (thirty) in French, and words for thirty in other Indo-European languages [source].

Thirty is also trideg (three-ten) in Welsh in the decimal version of the numbers. For other words for thirty, see the post about words for ten, as thirty is 10 on 20 in the vigesimal system.

Sources: Wiktionary, Am Faclair Beag, Online Manx Dictionary,, eDIL – Electronic Dictionary of the Irish Language, In Dúil Bélrai English – Old Irish glossary, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Gerlyvyr Cernewec, Dictionaire Favereau, TermOfis, Le dictionnaire diachronique du breton, Geriafurch, English – ProtoCeltic WordList (PDF), Etymological Dictionary Of Proto Celtic

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