Definitions for facial expression
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Princeton's WordNet
facial expression, facial gesture(noun)
a gesture executed with the facial muscles
expression, look, aspect, facial expression, face(noun)
the feelings expressed on a person's face
"a sad expression"; "a look of triumph"; "an angry face"
Wiktionary
facial expression(Noun)
The expression or countenance that seems to an onlooker to be represented by the appearance of a person's face, resulting from specific use of that person's facial muscles.
U.S. National Library of Medicine
Facial Expression
Observable changes of expression in the face in response to emotional stimuli.
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