adjective
momentary
MOH-mun-tair-ee/ˈməʊmənteri/
Lasting for only a very short time.
The bursting bubble creates a momentary ring of droplets above the dish.

Etymology
The adjective ending attaches to momentum in its “short time” sense. The resulting Latin adjective already meant “of brief duration,” matching something that lasts only a moment.
In context
… cognitive debt is very different from momentary or in the- moment cognitive load
More examples
- After a momentary hesitation, she accepts the invitation.
- The lights flicker during a momentary power outage.
- A momentary distraction makes him miss the exit.
Forms
momentary
momentarily adverb — For only a very short time.