noun (n)

• the feelings expressed on a person's face(noun.attribute)

  Example:
  A sad expression.
  

  Synonym:
  aspect, face, facial expression, look
  

  source: wordnet30
• expression without words(noun.communication)

  Example:
  Tears are an expression of grief.
  

  Synonym:
  manifestation, reflection, reflexion
  

  source: wordnet30
• the communication (in speech or writing) of your beliefs or opinions(noun.communication)

  Example:
  Expressions of good will.
  He helped me find verbal expression for my ideas.
  

  Synonym:
  verbal expression, verbalism
  

  source: wordnet30
• a word or phrase that particular people use in particular situations(noun.communication)

  Example:
  Pardon the expression.
  

  Synonym:
  locution, saying
  

  source: wordnet30
• the style of expressing yourself(noun.communication)

  Example:
  His manner of expression showed how much he cared.
  

  Synonym:
  formulation
  

  source: wordnet30
• a group of symbols that make a mathematical statement(noun.communication)

  Synonym:
  formula
  

  source: wordnet30
• (genetics) the process of expressing a gene(noun.process)

  source: wordnet30
• a group of words that form a constituent of a sentence and are considered as a single unit(noun.communication)

  Synonym:
  construction, grammatical construction
  Antonym:
  misconstruction
  

  source: wordnet30
• the act of forcing something out by squeezing or pressing(noun.act)

  Example:
  The expression of milk from her breast.
  

  source: wordnet30
• The act of expressing; the act of forcing out by pressure; as, the expression of juices or oils; also, of extorting or eliciting; as, a forcible expression of truth.(noun)

  source: webster1913