köken: Inherited from Old French soissante, seixante, from Latin sexāgintā, from Proto-Indo-European *sweḱsḱomt, from earlier *swéḱs-dḱomt (“six-ten”).
sixty (the cardinal number occurring after fifty-nine and before sixty-one, represented in Roman numerals as LX and in Arabic numerals as 60)
köken: Inherited from Old Spanish sessaenta (“threescore”), from Latin sexāgintā, from Proto-Indo-European *sweḱsḱomt, from earlier *swéḱs-dḱomt (“six-ten”).
köken: Inherited from Middle Persian [Term?] (/šast/), from Proto-Indo-Iranian *šwaštiš, from Proto-Indo-European *swéḱsdḱomt. The abnormal spelling with saad originated to differentiate it from شست (šast).
köken: Inherited from Proto-Turkic *altmïĺ (“sixty”). Cognate with Turkish altmış, Azerbaijani altmış, Uzbek oltmish, Kazakh алпыс (alpys, “sixty”), etc.
köken: From Byzantine Greek ἑξήντα (hexḗnta), from Ancient Greek ἑξήκοντα (hexḗkonta), from Proto-Indo-European *sweḱsḱomth₂, from the earlier *swéḱs-dḱomt-h₂ (“six-ten”). Compare Mariupol Greek кси́нда (ksínda).
köken: Inherited from Sauraseni Prakrit सट्ठी (saṭṭhī), from Sanskrit षष्टि (ṣaṣṭi), from Proto-Indo-Aryan *ṣwaṭṣHtí, from Proto-Indo-Iranian *šwaćšHtí, from Proto-Indo-European *swéḱsh₁ḱomt (“six-ten”).
köken: Cognate with Northern Mansi хо̄тпан (hōtpan, “60”). From the numeral hat (“six”) + van where van cannot be attested as an independent word (it is not the verb van). Compare also nyolcvan (“80”) as well as negyven (“40”), ötven (“50”), hetven (“70”), and kilencven (“90”). The second element might be related to Finnish moni (see the other cognates there), deriving from Proto-Uralic *mone, *mune.…
Inherited from Volga Bulgar اَلطْمُل (altmul, “sixty”), from Proto-Turkic *altmïĺ. Cognate with Khalaj altmış, Turkish altmış, Uzbek oltmish, and Bashkir алтмыш (altmış).