an indefinitely short period of time; instant

I'll be with you in a moment.

the present time or any other particular time (usually prec. by the )

He is busy at the moment.

a definite period or stage, as in a course of events; juncture

at this moment in history.

importance or consequence

a decision of great moment.

a particular time or period of success, excellence, fame, etc.

His big moment came in the final game.

Statistics . the mean or expected value of the product formed by multiplying together a set of one or more variates or variables each to a specified power.

Philosophy .

an aspect of a thing.

Obsolete . an essential or constituent factor.

Mechanics .

a tendency to produce motion, esp. about an axis.

the product of a physical quantity and its directed distance from an axis

moment of area; moment of mass.

noun

triviality , unimportance

noun

bit , breathing , crack , date , flash , hour , instant , jiff , jiffy * , juncture , minute , nothing flat , no time , occasion , point , point in time , sec , second , shake , split second * , stage , three winks , tick * , time , trice , twinkle * , twinkling * , while , wink * , advantage , avail , concern , consequence , gravity , import , magnitude , momentousness , note , pith , profit , seriousness , significance , signification , substance , use , value , weight , weightiness , worth , twinkle , twinkling , wink , concernment , significancy , consideration , element , ephemerality , force , impetus , importance , jiffy , materiality , momentum