concentrate
verb
°To bring to, or direct toward, a common center; to unite more closely; to gather into one body, mass, or force.
"to concentrate rays of light into a focus"
°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; -- opposed to dilute.
"to concentrate acid by evaporation"
noun
°A substance that is in a condensed form.