The Oxford Thesaurus An A-Z Dictionary of Synonyms - momentn.

1) instant, second, minute, half a second, two seconds, flash, twinkling, blink or wink of an eye, twinkling of an eye, trice, Colloq jiffy, shake, two shakes (of a lamb's tail) , before you can say 'Jack Robinson', Brit mo, half a mo, tick: I'll be with you in a moment, Madam. 2) instant, time, second, minute, hour, point (in time) , juncture, stage: At that very moment, the phone rang. 3) importance, weight, consequence, significance, import, gravity, seriousness, prominence, concern, note, interest, consideration: What you decide to do is of no great moment. MOMENTOUS adj. important, weighty, consequential, significant, grave, serious, decisive, crucial, critical, vital, pivotal, portentous, charged, laden, fraught, of concern: The Augustan Age was a momentous period in Latin literature.