Noun

(uncountable) Agitation; the state of being perturbed

(countable) A small change in a physical system, or more broadly any definable system (such as a biological or economic system)

(countable, astronomy, physics) Variation in an orbit due to the influence of external bodies

Noun

(en noun)

A state of turbulent motion.

An agitated disturbance or a hubbub.

* {{quote-book, year=1963, author=(Margery Allingham), title=(The China Governess)

, chapter=19 citation , passage=When Timothy and Julia hurried up the staircase to the bedroom floor, where a considerable commotion was taking place, Tim took Barry Leach with him. He had him gripped firmly by the arm, since he felt it was not safe to let him loose, and he had no immediate idea what to do with him.}}

(euphemistic) Sexual excitement.

{{quote-Fanny Hill, part=3 , and now, glancing my eyes towards that part of his dress which cover'd the essential object of enjoyment, I plainly discover'd the swell and commotion there}}