A mathematical function resulting in a smoothly varying repetitive wave-shape. The basic equation as a function of time is:

y(t)=A∙sin(ωt+φ)

where t=time in seconds, A = the peak amplitude of the wave’s deviation from its centre position, ω = the angular frequency in radians/second, φ = phase

The sound of an acoustic sine wave (usually known as a pure tone), where the y dimension = pressure variation, is closely approximated by the vibration of a tuning fork.

Also called sinusoid.