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The definition of expression

9 Definitions of: expression

    1. noun, the act or an instance of transforming ideas into words
    2. noun, a manifestation of an emotion, feeling, etc, without words
    3. noun, communication of emotion through music, painting, etc
    4. noun, a look on the face that indicates mood or emotion
    5. noun, the choice of words, phrases, syntax, intonation, etc, in communicating
    6. noun, a particular phrase used conventionally to express something
    7. noun, the act or process of forcing or squeezing out a liquid
    8. noun, maths a variable, function, or some combination of constants, variables, or functions
    9. noun, genetics the effect of a particular gene on the phenotype
    10. Show me some examples of this word: expression
    11. Show me the etymology of the word: expression

From Collins