concentrate
vb
1 to come or cause to come to a single purpose or aim
to concentrate one's hopes on winning
2 to make or become denser or purer by the removal of certain elements, esp. the solvent of a solution
3 tr to remove rock or sand from (an ore) to make it purer
4 intr; often foll by: on to bring one's faculties to bear (on); think intensely (about)
n
5 a concentrated material or solution
tomato concentrate
(C17: back formation from concentration, ultimately from Latin com- same + centrum centre)
♦
concentrator n