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From: Webster's Revised Unabridged Dictionary (1913)

 Con·cen·trate v. t. [imp. & p. p. Concentrated; p. pr. & vb. n. Concentrating.]
 1. To bring to, or direct toward, a common center; to unite more closely; to gather into one body, mass, or force; to fix; as, to concentrate rays of light into a focus; to concentrate the attention.
    (He) concentrated whole force at his own camp.   --Motley.
 2. To increase the strength and diminish the bulk of, as of a liquid or an ore; to intensify, by getting rid of useless material; to condense; as, to concentrate acid by evaporation; to concentrate by washing; -- opposed to dilute.
    Spirit of vinegar concentrated and reduced to its greatest strength.   --Arbuthnot.
 Syn: -- To combine; to condense; to consolidate.