v. & n.
v. 1 intr. (often foll. by on, upon) focus all one's attention or mental ability. 2 tr. bring together (troops, power, attention, etc.) to one point; focus. 3 tr. increase the strength of (a liquid etc.) by removing water or any other diluting agent. 4 tr. (as concentrated adj.) (of hate etc.) intense, strong.
n. 1 a concentrated substance. 2 a concentrated form of esp. food. concentratedly adv. concentrative adj. concentrator n.
[ after concentre f. F concentrer (as con- + centre) ]