1. the feelings expressed on a person’s face; “a sad expression”; “a look of triumph”; “an angry face”
  2. expression without words; “tears are an expression of grief”; “the pulse is a reflection of the heart’s condition”
  3. the communication (in speech or writing) of your beliefs or opinions; “expressions of good will”; “he helped me find verbal expression for my ideas”; “the idea was immediate but the verbalism took hours”
  4. a word or phrase that particular people use in particular situations; “pardon the expression”
  5. the style of expressing yourself; “he suggested a better formulation”; “his manner of expression showed how much he cared”
  6. a group of symbols that make a mathematical statement
  7. (genetics) the process of expressing a gene
  8. a group of words that form a constituent of a sentence and are considered as a single unit; “I concluded from his awkward constructions that he was a foreigner”
  9. the act of forcing something out by squeezing or pressing; “the expression of milk from her breast”