concentrate (v.) Look up concentrate at Dictionary.com
1630s, "to bring or come to a common center," from concenter (1590s), from Italian concentrare, from Latin com- "together" (see com-) + centrum "center" (see center (n.)). Meaning "condense" is from 1680s. Sense of "mentally focus" is c.1860. Related: Concentrated; concentrating.
concentrate (n.) Look up concentrate at Dictionary.com
1883, from concentrate (v.).