/ Thesaurus / S Synonyms of s.t.p. Find synonyms for: Noun1. STP, s.t.p., standard temperature, standard atmosphere, atmosphere, atm, standard pressureusage: standard temperature and pressureWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: knead Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language