the minimum distance along the earth's surface between the position of a short-wave transmitter and the region where its signal is received after one reflection from the ionosphere.
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British Dictionary definitions for skip distance
the shortest distance between a transmitter and a receiver that will permit reception of radio waves of a specified frequency by one reflection from the ionosphere
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012