Impulsus

Part of speech: noun

Definitions

1. A force or impetus that initiates movement or action ; an underlying stimulus that drives a process or reaction ; an instigating influence causing change or development
2. The originating energy or push that sets something in motion ; a motivating factor behind behavior or events ; a triggering cause prompting progression or activity
3. A dynamic thrust or surge that activates movement ; an internal or external excitation leading to a response ; a primary catalyst prompting transformation or motion

Etymology: Latin "impulsus" meant a push, a thrust, or a shove, the kind of force that sets something moving. It comes from the verb "impellere," "to drive against," which combines "in-" (against) with "pellere," "to push or drive." Like many Latin nouns, it is the past participle of that verb, turned into a noun for the action or its result. In later descendants, the physical push became an inner one. English "impulse" now names a sudden urge felt from within rather than a force applied from outside. The word thus moved from something done to a body to something a mind feels, while keeping the image of being driven forward from behind.

Synonyms: impulse, drive, thrust, momentum

Antonyms: rest, halt, pause