Meaning of greatest-integer function

great'est-in'te•ger func"tion

Pronunciation: (grā'tist-in'ti-jur), [key]
  1. the function that assigns to each real number the greatest integer less than or equal to the number. Symbol: [x]
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.