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Definition of expression for Students. 1  1 : the act or process of making known especially in words. 2  2 : a meaningful word or saying Grandpa uses old-fashioned expressions. 3  3 : the look on someone's face She had a pleased expression. 4  4 : a way of speaking, singing, or playing that shows mood or feeling She read her lines with expression.
Facial expression. A facial expression is one or more motions or positions of the muscles beneath the skin of the face. These movements convey the emotional state of an individual to observers.Facial expressions are a form of nonverbal communication.iktionary (0.00 / 0 votes) Rate this definition: 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.