(p. pr. & vb. n.) of Intrude.

amplitude antagonism antinode antipathy arrest arrestation arrestment atmospherics backlash blaring blasting blind spot block blockage blocking check clashing clogging closing up closure collision conflict confutation constriction contradiction contraposition contrariety counteraction counterposition counterworking cramp crankiness crawling creeping crest crotchetiness de Broglie wave delay detainment detention difficulty diffraction dissent drift electromagnetic radiation electromagnetic wave encroachment encumbrance entrance entrenchment fade-out fading fixation foot-dragging frequency frequency band frequency spectrum friction frustration guided wave hampering handicap hindering hindrance hitch holdback holdup impedance impediment impingement imposition in phase incursion infiltration influx infringement inhibition injection inroad insinuation interceding intercession interjection interloping interposition interposure interruption intervention intruding intrusion invasion irruption kick let light longitudinal wave mechanical wave meddling negativism node noise nonconformity nuisance value obstruction obstructionism obtrusion occlusion opposition opposure oppugnance oppugnancy out of phase period periodic wave perverseness radio wave ray reaction recalcitrance reception recoil reinforcement renitency repercussion repression repugnance resistance resonance resonance frequency restraint restriction retardation retardment revolt seismic wave setback shock wave snag sound wave squeeze static stranglehold stricture suppression surface wave swimming upstream tidal wave transverse wave trespass trespassing trough unlawful entry wave wave equation wave motion wave number wavelength