Source : Webster's Revised Unabridged Dictionary (1913)

Momentarily \Mo"men*ta*ri*ly\, adv.
   Every moment; from moment to moment.

Source : WordNet®

momentarily
     adv 1: for an instant or moment; "we paused momentarily before
            proceeding"; "a cardinal perched momently on the
            dogwood branch" [syn: {momently}]
     2: at any moment; "she will be with you momently" [syn: {in a
        moment}, {momently}]