60

/ˈsiks-tē/

Middle English, from sixty, adjective, from Old English siextig, noun, group of sixty, from siex six + -tig group of ten; akin to Old English tīen ten

noun

  1. a number that is equal to six times 10

  2. the numbers 60 to 69; specifically : the years 60 to 69 in a lifetime or century

noun

  1. a heavy radioactive isotope of cobalt of the mass number 60 produced in nuclear reactors and used as a source of gamma rays (as for radiotherapy)