WordReference Random House Unabridged Dictionary of American English © 2025
au•to•ig•ni•tion
(ô′tō ig nish′ən),USA pronunciation n.
- Automotivethe 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.
- ChemistrySee spontaneous combustion.
- auto-1 + ignition
'autoignition' also found in these entries (note: many are not synonyms or translations):