Period
The Time Required For One Complete Cycle Of Oscillation.

Frequency
The Number Of Oscillations Per Second, Inversely Related To Period.

Wave
A Disturbance That Transfers Energy Through Space Or Matter Without Transferring Mass.

Transverse Wave
A Wave In Which Particles Move Perpendicular To The Direction Of Wave Travel.

Longitudinal Wave
A Wave In Which Particles Move Parallel To The Direction Of Wave Travel.

General Relativity
A Theory Describing Gravity As The Curvature Of Spacetime Caused By Mass And Energy.

Wavelength
The Distance Between Successive Crests Or Compressions In A Wave.

Spacetime
A Four Dimensional Continuum Combining Space And Time, Central To Relativity.

Amplitude
The Maximum Displacement From Equilibrium In A Wave Or Oscillation.

Time Dilation
A Phenomenon In Special Relativity In Which Time Passes More Slowly For Objects Moving At High Speeds.