Meaning

noun the cardinal number that is the product of ten and six

adjective being ten more than fifty

originInherited from Middle English sixty, sexty, Old English sixtiġ, from Proto-Germanic *sehs tigiwiz (“sixty”), equivalent to six + -ty. Cognate with Scots sexty, saxty (“sixty”), Saterland Frisian säkstich (“sixty”), West Frisian sechstich (“sixty”), Dutch zestig (“sixty”), German Low German sesstig (“sixty”), German sechzig (“sixty”), Swedish sextio (“sixty”), Norwegian seksti (“sixty”), Icelandic…

Etymology from Wiktionary, CC BY-SA 3.0