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