Etymology
Advertisement
sixty (adj., n.)

"1 more than fifty-nine, twice thirty; the number which is one more than fifty-nine; a symbol representing this number;" Old English sixtig, from siex (see six) + -tig (see -ty (1)). Similar formation in Old Norse sextugr, sextögr, sextigir, Old Frisian sextich, Middle Dutch sestig, Dutch zestig, Old High German sehszug, German sechzig. Phrase sixty-four dollar question is attested from 1942, from a radio quiz show where that was the top prize.

Related entries & more 
Advertisement
sixty-nine (adj., n.)

"1 more than sixty-eight; the number which is one more than sixty-eight; a symbol representing this number;" see sixty + nine. In the sexual sense, 1888, as a translation of French faire soixante neuf, literally "to do 69." So called from the similarity of positions to the arrangement of the numerals.

Related entries & more 
sixtyfold 
also sixty-fold, Old English sixtigfeald; see sixty + -fold.
Related entries & more 
sixtieth (adj., n.)

"next in order after the fifty-ninth; an ordinal numeral; being one of sixty equal parts into which a whole is regarded as divided;" Old English sixteogoða "sixtieth;" see sixty + -th (1).

Related entries & more 
sixties (n.)
1848 as the years of someone's life between 60 and 69; 1827 as the seventh decade of years in a given century. See sixty.
Related entries & more 
Advertisement
sexagenarian (n.)

1738, "person sixty years old or between sixty and seventy years old," from Latin sexagenarius "containing sixty," from sexagenarius, from sexageni "sixty each, sixty at a time," from sexaginta "sixty," from combining form of sex (see six). With -genaria "ten times," from -ginta "tens" (from PIE *dkm-ta-, from root *dekm- "ten"). As an adjective, "pertaining to or characteristic of the age from sixty to seventy," from 1836.

Related entries & more 
sexagesimal (adj.)

"composed of or produced by sixties; pertaining to division into sixty," 1680s, from Medieval Latin sexagesimalis, from Latin sexagesimus "the sixtieth," from sexaginta "sixty." Sexagisema, "second Sunday before Lent" (eighth before Easter), is from late 14c. (Sexagesime), from Medieval Latin sexagesima (dies) "the sixtieth (day)."

Related entries & more 
hemidemisemiquaver (n.)

"sixty-fourth note" in music, 1846, from hemi- + demi- + semi- + quaver (n.).

Related entries & more 
shock (n.2)

"sheaves of grain placed on-end and leaning against one another in a field, arranged so as to shed rain and allow the grain to dry," early 14c., shok, perhaps from an unrecorded Old English word or from Middle Low German schok "shock of corn," originally "group of sixty," from Proto-Germanic *skukka- (source also of Old Saxon skok, Dutch schok "sixty pieces; shock of corn;" German schock "sixty," Hocke "heap of sheaves"). The original sense of this is uncertain; perhaps it is connected to the source of shock (n.1) on the notion of being "thrown" together [Century Dictionary]. The English word in 16c.-17c. sometimes was a unit of tale meaning "60-piece lot," from trade with the Dutch.

Related entries & more 
seventieth (adj., n.)

"next in order after the sixty-ninth; being one of seventy equal parts into which a whole is regarded as divided;" c. 1300, seventithe, from seventy + -th (1). It replaced earlier forms from Old English (hund)seofontigoþa. In Middle English also sometimes seuentiand, by influence of Old Norse ordinal ending -tugonde. Compare German siebenzigste, Old Norse sjautugti. As a noun, "ordinal number corresponding to seventy."

Related entries & more