Noun expression has 9 senses
  1. expression, look, aspect, facial expression, face - the expression on a person's face; "a sad expression"; "a look of triumph"; "an angry face"
    --1 is a kind of countenance, visage
    --1 has particulars: leer; sparkle, spark, light
  2. expression, manifestation, reflection, reflexion - expression without words; "tears are an expression of grief"; "the pulse is a reflection of the heart's condition"
    --2 is a kind of demonstration, demo
    --2 has particulars:
     lamentation, mourning; laughter; act; effusion, gush, outburst, blowup, ebullition
  3. expression - the communication (in speech or writing) of your beliefs or opinions; "expressions of good will"; "he helped me find expression for my ideas"
    --3 is a kind of
    communication, communicating
    --3 has particulars:
     articulation, voice; cold turkey; congratulation, felicitation
    Derived form: verb express2
  4. saying, expression, locution - a word or phrase that particular people use in particular situations; "pardon the expression"
    --4 is a kind of speech, speech communication, spoken communication, spoken language, language, voice communication, oral communication
    --4 has particulars:
     Beatitude; logion; calque, loan translation; advice and consent; ambiguity; euphemism; dysphemism; shucks; tongue twister; anatomical reference, anatomical; southernism; motto, slogan, catchword, shibboleth; maxim, axiom; epigram, quip; proverb, adage, saw, byword; idiom, idiomatic expression, phrasal idiom, set phrase, phrase; agrapha; sumpsimus
  5. formulation, expression - the style of expressing yourself; "he suggested a better formulation"; "his manner of expression showed how much he cared"
    --5 is a kind of expressive style, style
    --5 has particulars:
     sentimentalism; honorific; archaism, archaicism; boilerplate; colloquialism; parlance, idiom; Americanism; Anglicism, Briticism, Britishism; wording, diction, phrasing, phraseology, choice of words, verbiage
  6. formula, expression - a group of symbols that make a mathematical statement
    --6 is a kind of mathematical statement
    --6 has particulars: sentential function; primitive; exponential expression
  7. expression - (genetics) the process of expressing a gene
    --7 is a kind of
    organic process, biological process
    Derived form: verb express5
  8. construction, grammatical construction, expression - 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"
    --8 is a kind of constituent, grammatical constituent
    --8 has particulars:
     adjunct; clause; complement; involution; phrase; predicator
  9. expression - the act of forcing something out by squeezing or pressing; "the expression of milk from her breast"
    --9 is a kind of
    squeeze, squeezing
    Derived form: verb express6