Concentrate
CONCENTRATE, verb transitive [See Concenter.]
1. To bring to a common center, or to a closer union; to cause to approach nearer to a point, or center; to bring nearer to each other; as, to concentrate particles of salt by evaporating the water that holds them in solution; to concentrate the troops in an army; to concentrate rays of light into a focus.
2. To increase the specific gravity of a body.