significant UK /sɪɡˈnɪf.ɪ.kənt/US /sɪɡˈnɪf.ə.kənt/adjective 6noun 1forms 3 adjective6 •important, and making a clear difference to somethingThat was a significant step in the right direction.The First World War was a significant event. •Reasonably large in number or amount. •Having a low probability of occurring by chance (for example, having high correlation and thus likely to be related). •Signifying something; carrying meaning.It was well said of Plotinus, that the stars were significant, but not efficient. — 1614 •Having a covert or hidden meaning. •Of a digit or figure, see significant figure. noun1 •That which has significance; a sign; a token; a symbol.In dumb significants proclaim your thoughts. — 1591 formssignificants · more significant · most significant