[f. as prec. + -ING1.] The action of the verb CONCENTRATE. Also attrib.
1823. J. Badcock, Dom. Amusem., 19. The idea … of concentrating the acid whose presence in wood he had so detected.
1872. Raymond, Statist. Mines & Mining, 47. A new concentrating machine. Ibid. Sand which has gone through several concentrating processes.
1886. Laughton, in Dict. Nat. Biog. VI. 387/1. Concentrating marks were made on the decks, and at Broke’s own cost sights were fitted to the guns.
