Definition of: amplitude

(am′plə·td, -tyd) noun
1. Greatness of extent; largeness; breadth; the state or quality of being ample: the amplitude of the oceans.
2. Fullness or completeness; abundance or richness: the amplitude of life.
3. Broad range or scope, as of mental capacity: an amplitude of talent.
4. Astron. The arc of the horizon between true east and west and the center of the sun, moon, or any star at its rising or setting.
5. Physics The extent of the swing of a vibrating body on each side of the mean position.
6. Electr. The peak value attained by an alternating current during one complete cycle. [ < L amplitudo < amplus large]