(physics, mathematics) The mathematical basis for quantum mechanics in which light and subatomic particles have the characteristics of both waves and particles.

Any of several forms of vibrational waves that travel through the Earth as the result of an earthquake or underground explosion.

(physics) Any wave that is propagated by the compression of a fluid; examples include sound

(physics) a wave that is not bounded by a given space, but can propagate freely / (physics) a wave in which the vibration is in the direction of propagation; a longitudinal wave

(physics) a collection of waves, travelling together / (physics) a probability wave

A type of electrical activity in the brain; a brain wave with a frequency of 4-8 hertz.

(physics) The longitudinal wave of pressure that is transmitted through any plastic material; audible sound.

(trigonometry, signal processing) A periodically oscillating waveform as described by the sine function, possibly multiplied by some amplitude, shifted by some phase, and translated by an additive constant.

(idiomatic) A period of exceptionally hot weather. / (US, weather broadcasting) Three consecutive days with daytime high temperature of 90 degrees Fahrenheit or higher.

A large and sudden rise and fall in the tide. / (proscribed) A large, sudden, and disastrous wave of water caused by a tremendous disturbance in the ocean; a tsunami. (See Usage notes below.)