sixty

American  

[siks-tee] / ˈsɪks ti /

noun

sixties plural

1. a cardinal number, ten times six.

2. a symbol for this number, as 60 or LX.

3. a set of this many persons or things.

4. sixties, the numbers, years, degrees, or the like, from 60 through 69, as in referring to numbered streets, indicating the years of a lifetime or of a century, or noting degrees of temperature.

   Her grandfather is in his late sixties. The temperature is in the low sixties.

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adjective

1. amounting to 60 in number.

idioms

1. like sixty, with great speed, ease, energy, or zest.

   Everyone was working like sixty to finish up before the holidays.

sixty British  

/ ˈsɪkstɪ /

noun

1. the cardinal number that is the product of ten and six See also number

2. a numeral, 60, LX, etc, representing sixty

3. something represented by, representing, or consisting of 60 units

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determiner

1. 1. amounting to sixty

      sixty soldiers

   2. ( as pronoun )

      sixty are dead

Other Word Forms

Inflected Forms

noun

• sixties
  plural

Etymology

Origin of sixty

before 900; Middle English (adj. and noun), Old English sixtig (adj.); cognate with Dutch zestig, German sechzig, Old Norse sextigir. See six, -ty ¹

Example Sentences

The relevant piece of US law, the decades-old War Powers Resolution, makes certain requirements of a president "within sixty calendar days" of their use of US armed forces within a combat.

From BBC • May 1, 2026

For nearly sixty years, the tenets of the treaty have been respected by all nations.

From Salon • Apr. 9, 2026

Dr. Ilko's conclusions are based on ten years of research that took her to more than twenty archives and over sixty Augustinian sites, including remote and difficult to access ruins.

From Science Daily • Feb. 2, 2026

"For over sixty years, Bobby took to the road," the statement said.

From Barron's • Jan. 11, 2026

In his letter, Grandpa told Mama and Papa that he had done some trading with a Cherokee Indian for sixty acres of virgin land, and that it was theirs if they wanted it.

From "Summer of the Monkeys" by Wilson Rawls