concentrate

verb

• 1 [no object] focus all one’s attention on a particular object or activity:she couldn’t concentrate on the film [with object]:a threatened tax rise concentrates the mind wonderfully
• (concentrate on/upon) do or deal with (one particular thing) above all others:Luke wants to concentrate on his film career

• 2 [with object] gather (people or things) together in a common location:the nation’s wealth was concentrated in the hands of the governing elite
• [no object] come together in a common location:troops were concentrating at the western front

• 3 [with object] increase the strength or proportion of (a substance or solution) by removing or reducing the other diluting agent or by selective accumulation of atoms or molecules: plants and micro-organisms can concentrate metals from the environment

noun

• a substance made by removing or reducing the diluting agent; a concentrated form of something:apple juice concentrate