Harness  —n. 1 equipment of straps etc. By which a horse is fastened to a cart etc. And controlled. 2 similar arrangement for fastening a thing to a person's body. —v. 1 a put a harness on. B (foll. By to) attach by harness to. 2 make use of (natural resources), esp. To produce energy.  in harness in the routine of daily work. [french harneis military equipment]