A means of transferring energy from one point to another
wave
Particles on the wave vibrate perpendicular to the direction that the wave is moving
transverse wave
Particles on these waves vibrate parallel to the direction that the wave is moving (through a series of compressions and rarefactions)
longitudinal
Require a medium to travel through (Ex: water waves and sound waves) 
mechanical
Do not require a medium (ex: light and radio waves)
electromagnetic
The distance from a point on one wave to the identical point on the next wave (crest to crest)
wavelength
The number of waves passing each second; it is measured in Hertz
frequency
Maximum displacement of a wave from the rest position or the size of the wave or how large the wave is
amplitude
Waves will bounce off barriers an angle equal to the angle they strike the barrier
reflection
Bending of a wave as it passes at an angle into another medium
refraction
Bending of waves around barriers (this occurs to a greater degree with longer waves such as sound)
diffraction
Waves add as they meet
Constructive
The waves partly or completely cancel as they pass
destructive
Change in frequency is heard when the source of sound and the person receiving the sound are in relative motion
doppler effect
material through which a wave travels
medium
Unit of measurement for frequency
hertz
a disturbance that travels through a medium as a longitudinal wave
sound
perception of the frequency of sound
pitch
The high point of a wave.
crest
The low point of a wave
trough