Толковый словарь английского языка - amplitude

noun Date: 1542 extent of dignity, excellence, or splendor, the quality or state of being ample ; fullness, abundance, the extent or range of a quality, property, process, or phenomenon: as, the extent of a vibratory movement (as of a pendulum) measured from the mean position to an extreme, the maximum departure of the value of an alternating current or wave from the average value, the angle assigned to a complex number when it is plotted in a complex plane using polar coordinates