Englishrule of thumbnounMeaningA general guideline, rather than a strict rule; an approximate measure or means of reckoning based on experience or common knowledge.(usually hyphenated) Approximated, guesstimated.Related wordsguideline(English)guidepost(English)round number(English)empirical rule(English)approximative(English)approximation(English)rule(English)position(English)SourcesDictionaryAPI.dev English dictionary data