interference

n. act of impeding or obstructing; scrambling of waves or signals (Physics, Electronics); something which scrambles waves or signals (Physics, Electronics); blocking of an opposing player (Sports)

Interference is the addition (superposition) of two or more waves that results in a new wave pattern. As most commonly used, the term interference usually refers to the interaction of waves which are correlated or coherent with each other, either because they come from the same source or because they have the same or nearly the same frequency. Two non-monochromatic waves are only fully coherent with each other if they both have exactly the same range of wavelengths and the same phase differences at each of the constituent wavelengths.
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Noun
1. a policy of intervening in the affairs of other countries
(synonym) intervention
(antonym) nonintervention, noninterference
(hypernym) foreign policy
(derivation) intervene, step in, interfere, interpose
2. the act of hindering or obstructing or impeding
(synonym) hindrance
(hypernym) act, human action, human activity
(hyponym) frustration, thwarting, foiling
(derivation) interfere
3. electrical or acoustic activity that can disturb communication
(synonym) noise, disturbance
(hypernym) trouble
(hyponym) clutter
4. (American football) the act of obstructing someone's path with your body; "he threw a rolling block into the line backer"
(synonym) blocking, block
(hypernym) obstruction
(hyponym) trap block
(classification) American football, American football game
5. any obstruction that impedes or is burdensome
(synonym) hindrance, hitch, preventive, preventative, encumbrance, incumbrance
(hypernym) obstruction, obstructor, obstructer, impediment, impedimenta
(hyponym) clog

n. interference, interaction

(n.)
The mutual influence, under certain conditions, of two streams of light, or series of pulsations of sound, or, generally, two waves or vibrations of any kind, producing certain characteristic phenomena, as colored fringes, dark bands, or darkness, in the case of light, silence or increased intensity in sounds; neutralization or superposition of waves generally.
  

(n.)
The act or state of interfering; as, the stoppage of a machine by the interference of some of its parts; a meddlesome interference in the business of others.
  

(n.)
The act or state of interfering, or of claiming a right to the same invention.