1. for a very short time: "as he passed Jenny's door, he paused momentarily"Similarbrieflytemporarilyfleetinglyfor a momentfor a secondfor an instantfor a minutefor a little while
2. at any moment; very soon:North American"my husband will be here to pick me up momentarily"Similar(very) soonin a minutein a secondin a tricein a flashshortlyany minuteany minute nowin a short timein an instantin the twinkling of an eyein (less than) no timein no time at allbefore you know itbefore longinformal:in a jiffyin two shakesin two shakes of a lamb's tailbefore you can say Jack Robinsonin the blink of an eyein a blinkin the wink of an eyein a winkbefore you can say knifein a tickin two ticksin a moin a snaparchaic, informal:anonarchaic:ere long