American Heritage® Dictionary of the English Language, Fourth Edition
- n. The continuous line or surface including all the points in space reached by a wave or vibration at the same instant as it travels through a medium.
GNU Webster's 1913
- n. (Physics) the surface of initial displacement of the particles in a medium, as a wave of vibration advances.
- n. (physics) an imaginary surface joining all points in space that are reached at the same instant by a wave propagating through a medium
- n. all the points just reached by a wave as it propagates
“The explosion's main wave front would indeed be well past the asteroid by now, but there would also be slower but still dangerous debris expanding outward behind that front.”
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