"relating to muscular motion," 1841, from Greek kinetikos "moving, putting in motion," from kinetos "moved," verbal adjective of kinein "to move" (from PIE root *keie- "to set in motion").
Buster Keaton's subject was kinetic man, a being he approached with the almost metaphysical awe we reserve for a Doppelgänger. This being was, eerily, himself, played by himself, then later in a projection room, watched by himself: an experience never possible to any generation of actors in the previous history of the world. [Hugh Kenner, "The Counterfeiters," 1968]
From 1855 as "causing motion." Related: Kinetical; kinetically.
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Harper, D. (n.d.). Etymology of pharmacokinetics. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/pharmacokinetics