from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a wave that is not bounded by a given space, but can propagate freely
- n. a wave in which the vibration is in the direction of propagation; a longitudinal wave
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a wave in which the medium moves in the direction of propagation of the wave
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