/ Dictionary / Index S standard temperature and pressure: Meaning and Definition of Find definitions for: stand'ard tem'perature and pres'sure Pronunciation: [key] the temperature of 0°C and pressure of 1 atmosphere, usually taken as the conditions when stating properties of gases. Also calledAbbr.: STP Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. standard score standard time Related Content Daily Word Quiz: nonchalant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language