1. (n.) The act of intervening; interposition.

2. (n.) Any interference that may affect the interests of others; especially, of one or more states with the affairs of another; mediation.

3. (n.) The act by which a third person, to protect his own interest, interposes and becomes a party to a suit pending between other parties.

encroachment entrance entrenchment impingement imposition incursion infiltration influx infringement injection inroad insinuation interagency intercession intercurrence interference interjacence interjection interlocation interloping intermediacy intermediation interposition interposure interruption intervenience intrusion invasion involvement irruption mediation obtrusion sandwiching stepping in trespass trespassing unlawful entry