Main Entry: ex·pres·sion

Pronunciation: \ik-ˈspresh-ən\

Function: noun

1 a : something that manifests, represents, reflects, embodies, or symbolizes something else <the first clinical expression of a disease> b (1) : the detectable effect of a gene ; also : the sum of the processes (as transcription and translation) by which a gene is manifested in the phenotype <gene expression can be controlled by regulatory proteins that bind to specific sites on DNA—Mark Ptashne> (2) : expressivity
2 : facial aspect or vocal intonation as indicative of feeling
3 : an act or product of pressing out