Webster's English Dictionary

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insertion

in.ser.tion \in-'s*r-sh*n\ \-shn*l, -sh*n-*l\ n 1: the act or process of 
   inserting  2: something that is inserted : as  2a: the part of a muscle 
   that inserts  2b: the mode or place of attachment of an organ or part  2c: 
   embroidery or needlework inserted as ornament between two pieces of fab ric 
   2d: a single appearance of an advertisement  - in.ser.tion.al aj