/ Dictionary / Index S square wave: Meaning and Definition of Find definitions for: square' wave" Pronunciation: [key] — Math., Physics. Math.,Physics. a graph, function, vibration, etc., that is periodic and equal to one constant on one half of the period and a different constant, which may be zero, on the other half. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. square-toes square yard Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language