Definition of self-motion in English:

self-motion

Syllabification: self-mo·tion

Entry from US English dictionary

noun

Movement caused by oneself or itself, not by an external action or agent.

Derivatives

self-moving

adjective

Definition of self-motion in:

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Word of the day flippant
Pronunciation: ˈflɪp(ə)nt
adjective
not showing a serious or respectful attitude