1. 
   Preadmission
   Pre`ad·mis'sion noun Lit., previous admission; specif. (Engineering) , admission, as of steam, to the engine cylinder before the back stroke is completed, thus increasing the cushioning.
   Found op http://www.encyclo.co.uk/webster/P/143
   
   
2. 
   Preadmission
   • (n.) admission, as of steam, to the engine cylinder before the back stroke is completed, thus increasing the cushioning. • (n.) Lit., previous admission;
   Found op http://thinkexist.com/dictionary/meaning/preadmission/
   
   

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