To focus one's thought or attention (on).
To approach or meet in a common center; to consolidate.
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 bring to, or direct toward, a common center; to unite more closely; to gather into one body, mass, or force.
A substance that is in a condensed form.