Yes.

momentarily |ˌmōmənˈte(ə)rəlē|

adverb

1 for a very short time : as he passed Jenny's door, he paused momentarily.

2 at any moment; very soon : my husband will be here to pick me up momentarily.

The word 'momentarily' is an adverb, a word used to modify a verb, an adjective, or another adverb.

Examples:

He ran out for a quick errand and we expect him toreturn momentarily. (modifies the verb 'return')

We were momentarily afraid that we had missed the train. (modifies the adjective 'afraid')

I looked away from the toddler momentarily, but somehow he disappeared. (modifies the adverb 'away')