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con·cen·trate / ˈkänsənˌtrāt/ • v. 1. [intr.] focus one's attention or mental effort on a particular object or activity: she couldn't concentrate on the movie. ∎  (concentrate on/upon) do or deal with (one particular thing) above all others: Luke wants to concentrate on his film career. 2. [tr.] (often be concentrated) gather (people or things) together in numbers or in a mass to one point. ∎  [intr.] come together in this way: troops were concentrating at the western front. ∎  increase the strength or proportion of (a substance or solution) by removing or reducing the water or any other diluting agent or by selective accumulation of atoms or molecules. • n. a substance made by removing water or other diluting agent; a concentrated form of something, esp. food: apple juice concentrate. DERIVATIVES: con·cen·tra·tive / -ˌtrātiv/ adj. con·cen·tra·tor / -ˌtrātər/ n.

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concentrate •serrate • concentrate • airfreight •ingrate • filtrate • arbitrate •exfiltrate • magistrate • orchestrate •calibrate • celebrate • emigrate •immigrate • denigrate • penetrate •defenestrate • administrate • aspirate •perpetrate • decerebrate • desecrate •execrate • consecrate • integrate •carbohydrate, hydrate •nitrate • quadrate • prostrate •borate, quorate •portrait • polyunsaturate •acculturate • depurate • indurate •triturate • inaugurate • suppurate •substrate • adumbrate •ameliorate, meliorate •deteriorate •collaborate, elaborate •liberate • corroborate • reverberate •saturate •confederate, federate •desiderate • moderate •preponderate •proliferate, vociferate •perforate • invigorate • exaggerate •refrigerate • decorate •accelerate, decelerate •exhilarate • illustrate • tolerate •commemorate •demonstrate, remonstrate •agglomerate, conglomerate •enumerate •generate, venerate •incinerate, itinerate •exonerate • remunerate • evaporate •exasperate • separate •cooperate, operate •incorporate •recuperate, vituperate •perorate •lacerate, macerate •incarcerate • eviscerate • expectorate •alliterate, iterate, obliterate, transliterate •adulterate • asseverate • sequestrate •commiserate • birth rate • sensate •condensate • decussate • compensate •tergiversate

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concentrate bring to a COMMON centre. XVII. f. †concentre (XVI) — F. concentrer; see CON-, CENTRE vb., -ATE 3.
So concentration XVII. concentric having a common centre XIV (rare before XVII; concentrical from XVI). — (O)F. concentrique or medL. -icus; see -IC.

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