1. 
   Pre-ignition
   The ignition of the charge in the cylinder of an internal-combustion engine before it is fired by the sparking plug(s). Pre-ignition is caused by some overheated part, such as the sparking plug or exhaust valve or by incandescent carbon.
   Found op http://www.aeroplanemonthly.com/glossary/
   
   
2. 
   pre-ignition
   preignition, pre-ignition 1. The ignition of the fuel mixture in a gasoline engine cylinder before normal ignition by the spark plug, typically caused by overheated plug points. This results in an inefficient, rough-running engine. 2. Ignition of fuel in an internal-combustion engine before the sp...
   Found op http://www.wordinfo.info/words/index/info/view_unit/1050/3
   
   
3. 
   Preignition
   Picture of the former Australian cricketer Len Darling taken in the 1930s. The image is pre-1955 and therefore is in the public domain. ...
   Found op http://en.wikipedia.org/wiki/Preignition
   
   
4. 
   Preignition
   Pre`ig·ni'tion noun (Engineering) Ignition in an internal-combustion engine while the inlet valve is open or before compression is completed.
   Found op http://www.encyclo.co.uk/webster/P/150
   
   
5. 
   Preignition
   • (n.) Ignition in an internal-combustion engine while the inlet valve is open or before compression is completed.
   Found op http://thinkexist.com/dictionary/meaning/preignition/
   
   
6. 
   preignition
   preignition, pre-ignition 1. The ignition of the fuel mixture in a gasoline engine cylinder before normal ignition by the spark plug, typically caused by overheated plug points. This results in an inefficient, rough-running engine. 2. Ignition of fuel in an internal-combustion engine before the sp...
   Found op http://www.wordinfo.info/words/index/info/view_unit/1050/3
   
   

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