Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Origin: con- + Latin centrum 'center'

concentrate

1 verb
     
con‧cen‧trate1 S2 W2
1 [intransitive] to think very carefully about something that you are doing [↪ concentration]:
Now please concentrate.
Adrian was finding it difficult to concentrate.
concentrate on
Be quiet - let me concentrate on my homework.
2 [intransitive and transitive] to be present in large numbers or amounts somewhere, or to cause people or things to be present in large numbers or amounts somewhere [↪ concentration]
concentrate something in/at something
Italian industry is concentrated mainly in the north.
Construction of the aircraft is being concentrated at Prestwick.
concentrate in/at
Women concentrate in a small number of occupations.
3

something concentrates the mind

if something concentrates the mind, it makes you think very clearly:
Relaxing in a Jacuzzi concentrates the mind wonderfully.
4 [transitive] to make a substance or liquid stronger by removing some of the water from it [↪ concentrated]

concentrate (something) on something

phrasal verb
to give most of your attention or effort to one thing:
Doctors are aiming to concentrate more on prevention than cure.
concentrate your efforts/attention/energy/mind etc on something
I'm concentrating my efforts on writing my autobiography.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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