of notch-the act of making notches; the act of cutting into small hollows.-the small hollow, or hollows, cut; a notch or notches.-a method of joining timbers, scantling, etc., by notching them, as at the ends, and overlapping or interlocking the notched portions.-a method of excavating, as in a bank, by a series of cuttings side by side. see also gulleting.