n. The act of interfering; interposition; especially, intermeddling.n. A clashing or collision; the act of coming into violent contact.n. In farriery, a striking of one foot against the one next to it, as one hind foot against the other.n. In Amer. patent law, the conflict between two patents or applications for patent which claim in whole or in part the same invention.n. In physics, the mutual action of waves of any kind (whether those in water, or sound-, heat-, or light-waves) upon one another, by which, under certain conditions, the vibrations and their effects are increased, diminished, or neutralized.n. In base-ball and foot-ball, the act of interfering. See interfere, v. i., 5 and 6.