lasting for a very short time

क्षणिक

English Usage: The momentary pause in the conversation felt awkward.

Hindi Usage: बातचीत में क्षणिक रुकावट असहज लग रही थी।

a very brief period of time

क्षण

English Usage: She experienced a momentary thrill when she heard the news.

Hindi Usage: जब उसने खबर सुनी तो उसे एक क्षण का रोमांच मिला।