Am

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Am (length) [r]: A submultiple of the SI base unit of length, viz., the metre, equal to 10^-18 metres; 1 metre consists of 10¹⁸ attometres. ^[e]
Am (time) [r]: ante meridian, or before noon, time before midday: a.m. ^[e]
Amplitude modulation, a.k.a. AM [r]: Changing the height of the peaks of a periodic waveform, such as a radio wave, to carry information. ^[e]