Pronunciation: (ô"tō-ig-nish'un), [key]
1. Auto.the spontaneous ignition of fuel when introduced into the combustion chamber of an internal-combustion engine, as a result either of glowing carbon in the chamber or of the heat of compression.
2. See spontaneous combustion.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.