v.intr.
1. (usu. foll. by with) a (of a person) meddle; obstruct a process etc. b (of a thing) be a hindrance; get in the way.
2 (usu. foll. by in) take part or intervene, esp. without invitation or necessity.
3 (foll. by with) euphem. molest or assault sexually.
4 Physics (of light or other waves) combine so as to cause interference.
5 (of a horse) knock one leg against another.
Derivatives:
interferer n. interfering adj. interferingly adv.
Etymology: OF s' entreferir strike each other (as INTER-, ferir f. L ferire strike)