concentrate
‘to bring or come to a common center’
Lexical development traced from the Tamil root:
E. concentrat, concentrate, concenter < Ital. concentrare < con- (com-) ‘with, together’ + centrum ‘center’ < Gk. kentron ‘sharp point, goad, sting of a wasp’ < kentein ‘stitch’ < suhnt < kent- < Tamil kaṇṭam