Definition - The study of the non-verbal movements and gestures that humans use to communicate.

Example -
Waving your hand to say "goodbye."

Etymology -
The word derives from the Greek kinesis, movement.

Oxford English Dictionary -
Its first citation is from 1952:
"Introduction to kinesics: an annotation system for analysis of body motion and gesture."
(R. L. Birdwhistell (title))

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