concentrate

Concise Oxford English Dictionary © 2008 Oxford University Press:
concentrate/ˈkɒnsntreɪt/

▶verb

• 1 (often concentrate on) focus all one's attention on something.

• 2 bring together in numbers or a mass in one place.

• 3 increase the strength of (a solution).

▶noun a concentrated form of something, especially food.

– derivatives
concentrated adjective,
concentratedly adverb,
concentrative adjective,
concentrator noun.

– origin C17 (in the sense ‘bring towards a centre’): Latinized form of concentre, or from Fr. concentrer ‘to concentrate’.