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