Pronunciation: (am'pēr-tûrn", am-pēr'-), [key]
1. one complete convolution of a conducting coil, through which one ampere of current passes.
2. the magnetomotive force produced by one ampere passing through one complete turn or convolution of a coil. Abbr.: At
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.