n.
Pronunciation: ' siks-t ē
Function: noun
Inflected Form: plural sixties
Etymology: Middle English, from sixty, adjective, from Old English siextig, noun, group of sixty, from siex six + -tig group of ten; akin to Old English t ī en ten
Date: 14th century
1 ― see NUMBER table
2 plural : the numbers 60 to 69 specifically : the years 60 to 69 in a lifetime or century
– six · ti · eth \ ' siks-t ē - ə th \ adjective or noun
– sixty adjective
– sixty pronoun, plural in construction
– six · ty · ish \ ' siks-t ē -ish \ adjective