Phase
Phase The alignment or otherwise of two signals in time. 'In phase' means that they are aligned 'Out of phase' means that one or the other is shifted in time by one half the period (inverse of frequency) of the tone in question. If an out of phase pair are played together, they will cancel each other out. Phase is usually measured in degrees. A zero degree shift is in phase, while a 180 degree shift is out of phase. Causes of phase shift include filters (especially those in loudspeaker crossover networks) and the (lack of) time alignment of drivers in a loudspeaker.
Source: http://www.astintrew.co.uk/support/The%20Astin%20Trew%20Dictionary%20of%20Hi-Fi%20Terms%202008.pdf
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