A substance that is in a condensed form.

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.

“to concentrate acid by evaporation”

To approach or meet in a common center; to consolidate.

“Population tends to concentrate in cities.”