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Noun	1.	facial expression - a gesture executed with the facial muscles facial gesture emoticon - a representation of a facial expression (as a smile or frown) created by typing a sequence of characters in sending email; ":-( and :-) are emoticons" motion, gesture - the use of movements (especially of the hands) to communicate familiar or prearranged signals gape - an expression of openmouthed astonishment grimace, face - a contorted facial expression; "she made a grimace at the prospect" frown, scowl - a facial expression of dislike or displeasure grin, grinning, smile, smiling - a facial expression characterized by turning up the corners of the mouth; usually shows pleasure or amusement laugh - a facial expression characteristic of a person laughing; "his face wrinkled in a silent laugh of derision" snarl - an angry vicious expression straight face - a serious facial expression giving no evidence of interest or amusement wink - closing one eye quickly as a signal wince - the facial expression of sudden pain
	2.	facial expression - the feelings expressed on a person's face; "a sad expression"; "a look of triumph"; "an angry face" expression, look, face, aspect countenance, visage - the appearance conveyed by a person's face; "a pleasant countenance"; "a stern visage" leer - a suggestive or sneering look or grin sparkle, twinkle, spark, light - merriment expressed by a brightness or gleam or animation of countenance; "he had a sparkle in his eye"; "there's a perpetual twinkle in his eyes"

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References in classic literature

They sat rather like a very superior lot of waxworks, with the fixed but indetermined facial expression and with that odd air wax figures have of being aware of their existence being but a sham.

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He fell back on facial expression, to imply that he was interested and that she might tell all.

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Deep lines appeared on his forehead; for it is an awful thing for a football enthusiast to be compelled to applaud, in the very middle of the Cup-ties, purely by means of facial expression. In this time of affliction he found Isabel an ever-increasing comfort to him.

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They were at too great a distance for the Europeans to know whether their facial expressions portrayed pity or rage, but be that as it may, none offered to interfere.

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Tarzan had seen the surprise caused by his notice, and while he could understand nothing of the spoken language of these strange people their gestures and facial expressions told him much.

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They gulped the stuff down with many facial expressions of delight, followed by loud lip-smackings of approval, though the liquor was raw enough and corrosive enough to burn their mucous membranes.

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His quick-changing facial expressions might tell every thought and mood, but the tongue, perforce, ran hard after, repeating, like a second Boswell.

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After reviewing more than 1,000 studies, the five researchers concluded that the relationship between facial expression and emotion is nebulous, convoluted and far from universal.

'Emotion detection' AI is a $20B industry. But can it do what it claims?

Facial Expression Recognition remains a challenging task in the field of human behavior understanding, more especially when facial expressions such as happy, anger, sad, surprise, disgust, fear and neutral must be recognized from static images.

Circular Derivative Local Binary Pattern Feature Description for Facial Expression Recognition

Disgust, for example, needs just one facial expression to get its point across throughout the world.

Multiple ways of conveying happiness