n. Anything that intercepts anothern. A fast, maneuverable fighter aircraft designed to intercept and destroy enemy aircraft before they can attackn. A guided missile designed to intercept and destroy enemy missilesn. In Architecture / Engineering, A device to trap, remove, or separate deleterious, hazardous, or undesirable matter (such as oil, grease, gasoline, sand, and sediment) from normal waste conveyed through it, permitting normal sewage or liquid wastes to discharge into the disposal terminal by gravity.