The cardinal number occurring after fifty-nine and before sixty-one, represented in Roman numerals as LX and in Arabic numerals as 60.

plural of sixty

Alternative letter-case form of Sixties (The decade of the 1860s, 1960s, etc.) / The decade of one's life from age 60 through age 69. / (temperature, rates, plural only) The range between 60 and 69.

From or evoking the 61st through 70th years of a century (chiefly the 1960s).

The decade of the 1860s, 1960s, etc. (but especially the 1960s) / (US) A period in American history centered around the counterculture movement of the late 1960s.

The cardinal number immediately following sixty-three and preceding sixty-five.

The cardinal number immediately following sixty-eight and preceding seventy.

(sexuality) A sex position where two people give each other oral sex at the same time.

(slang) To have sex in the sixty-nine position: to engage in mutual oral sex.

The cardinal number immediately following sixty-seven and preceding sixty-nine.