instantly following its trigger event and lasting no longer than a moment.

The smile that crosses a person's face when you surprise them (with something good.)
giggles
blushes
perfection
You get the idea.

Mo`men*ta"ne*ous (?), Mo"men*ta*ny (?), a. [L. momentaneus: cf. F. momentan'e.]

Momentary.

[Obs.] Hooker. "Momentany as a sound."

Shak.

 

© Webster 1913.

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