1. (a.) Deserving to be considered; important; momentous; as, a significant event\.

2. (a.) Fitted or designed to signify or make known something having a meaning; standing as a sign or token; expressive or suggestive; as, a significant word or sound; a significant look.

3. (n.) That which has significance; a sign; a token; a symbol.

absolute adducible admissible allegorical associational attestative attestive augural authentic based on big big-league big-name big-time bigwig bigwigged certain circumstantial cogent compelling conclusive connotational connotative consequential considerable conspicuous convincing critical cumulative damning decisive definable demonstrative denominative denotational denotative designative determinative diagnostic documentary documented double-barreled earthshaking eloquent emblematic evidence evidential evidentiary ex parte exhibitive expressive extended extensional eye-witness factual facund figural figurative final firsthand forceful forerunning foreshadowing foreshowing foretokening forewarning founded on full of meaning full of point full of substance grand great grounded on hearsay heavy with meaning heavyweight high-powered historic identifying ideographic idiosyncratic implicative implicit important impressive in the limelight incontrovertible index indicating indicative indicatory indisputable individual informative intelligible intensional interpretable intuitive irrefutable irresistible major mark material meaning meaningful meaty meritorious metaphorical momentous monitory name naming notable noteworthy nuncupative outstanding overwhelming pathognomonic peculiar pithy pointed powerful precursive precursory predictive prefigurative pregnant preindicative premonitory presageful presaging presumptive probative prognostic prognosticative prominent readable referential relevant reliable representative rich self-important semantic semiotic sententious sign signal signalizing significative signifying sound substantial substantive suggestive superior sure symbolic symbolistic symbological symptom symptomatic symptomatologic telling to the front token transferred typical valid valuable valued warning weighty world-shaking