1. Squeezing out; expelling by pressure. 2. Mobility of the features giving a particular emotional significance to the face. SYN: facies (3) [TA]. 3. Any act by an individual. 4. Something that manifests something else. 5. The act of allowing information to become manifest. 6. A mathematical function consisting of a combination of constants, variables, other functions, and mathematical operations.
- differential gene e. gene e. that responds to signals or triggers; a means of gene regulation; E.G., effects of certain hormones on protein biosynthesis.
- gene e. 1. the detectable effect of a gene. 2. appearance of an inherited trait; for many genetic ( e.g., recessiveness, hypostasis, parastasis) and environmental (the absence of pertinent challenges) reasons, a gene may not be expressed at all. In those circumstances, it will have no impact on Darwinian evolution.
- integrated rate e. an equation of a chemical or enzyme-catalyzed reaction for the entire progress curve.
- e. library a collection of plasmid or phage containing a representative sample of cDNA or genomic fragments that are constructed in such a way that they will be transcribed and translated by the host organism (usually bacteria).

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ex·pres·sion ik-'spresh-ən n
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 <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

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ex·pres·sion (ek-spreshґən) [L. expressio] 1. the aspect or appearance of the face as determined by the physical or emotional state. 2. the act of squeezing or evacuating by pressure. 3. gene e.

Medical dictionary. 2011.

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  • expression — [ ɛkspresjɔ̃ ] n. f. • 1547; méd. 1314 ; lat. expressio, de exprimere → exprimer I ♦ Action ou manière d exprimer, de s exprimer. L expression d un sentiment, d une sensation, d un événement vécu. ⇒ extériorisation. Le langage a deux fonctions… …   Encyclopédie Universelle

  • Expression — Ex*pres sion ([e^]ks*pr[e^]sh [u^]n), n. [L. expressio: cf. F. expression.] 1. 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.… …   The Collaborative International Dictionary of English

  • expression — Expression. s. f. Action par laquelle on exprime le suc, le jus de quelque chose. Le suc des herbes se tire en trois manieres, par expression, par infusion, par decoction. une expression de citron. Expression, signifie aussi, Les termes & la… …   Dictionnaire de l'Académie française

  • Expression — may refer to:* Idiom * Facial expression * Artificial discharge of breast milk; see breastfeeding * Expression (mathematics) * Expression (programming), an instruction to execute something that will return a value. * Microsoft Expression Studio,… …   Wikipedia

  • expression — ex·pres·sion n 1: an act, process, or instance of representing or conveying in words or some other medium: speech protected expression under the First Amendment 2: a mode or means of expressing an idea, opinion, or thought ◇ An expression is… …   Law dictionary

  • expression — [ek spresh′ən, ikspresh′ən] n. [ME expressioun < L expressio < expressus: see EXPRESS] 1. a pressing out or squeezing out, as of juice 2. a putting into words or representing in language 3. a picturing, representing, or symbolizing in art,… …   English World dictionary

  • Expression — [ɛksprɛˈsjoːn] (lat. expressio „Ausdruck“) bedeutet: Realisieren der Information, die in der DNA eines Gens gespeichert ist, siehe Genexpression Zellfreie Genexpression Verfahren zur Gewinnung von ätherischen Ölen ein Intonationsmittel bei… …   Deutsch Wikipedia

  • expression — early 15c., action of pressing out; later (mid 15c.) action of manifesting a feeling; (late 15c.) a putting into words, from M.Fr. expression (14c.), from L.L. expressionem (nom. expressio), noun of action from pp. stem of exprimere (see EXPRESS… …   Etymology dictionary

  • expression — [n1] verbalization announcement, argument, articulation, assertion, asseveration, choice of words, commentary, communication, declaration, definition, delivery, diction, elucidation, emphasis, enunciation, execution, explanation, exposition,… …   New thesaurus

  • Expression — (lat.), Ausdruck; beim Harmonium ein Zug, der den Wind ganz frei zu den Zungen zuströmen läßt und daher die Stärke der Tongebung von der Behandlung der Bälge (durch die Füße) abhängig macht …   Meyers Großes Konversations-Lexikon

  • expression — *phrase, locution, idiom …   New Dictionary of Synonyms

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