What is Concentrate ?
Concentrate is (verb) 1. to be very attentive The exam candidates were all concentrating hard when someone started to giggle. to concentrate on something to pay special attention to something Don’t talk – he’s trying to concentrate on his homework. The salesmen are supposed to concentrate on getting orders. 2. to put everything together in one place The enemy guns are concentrated on top of that hill.(noun) a substance which has been concentrated by extracting some of the water in it lemon concentrate
source: Easier English, Student Dictionary Upper Intermediate Level