1. A minor malfunction, mishap, or technical problem; a snag: a computer glitch; a navigational glitch; a glitch in the negotiations.
2. A false or spurious electronic signal caused by a brief, unwanted surge of electric power.
3. Astronomy. A sudden change in the period of rotation of a neutron star.

[Probably from Yiddish glitsh, a slip, lapse, from glitshn, to slip, from Middle High German glitschen, alteration of glīten, to glide, from Old High German glītan.]

WORD HISTORY   Although glitch seems a word that people would always have found useful, it is first recorded in English in 1962 in the writing of John Glenn: "Another term we adopted to describe some of our problems was 'glitch.' " Glenn then gives the technical sense of the word the astronauts had adopted: "Literally, a glitch is a spike or change in voltage in an electrical current." It is easy to see why the astronauts, who were engaged in a highly technical endeavor, might have generalized a term from electronics to cover other technical problems. Since then glitch has passed beyond technical use and now covers a wide variety of malfunctions and mishaps.

The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.