Webster's English Dictionary

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pun

1. pun \'p*n\ n [perh. fr. It puntiglio fine point, quibble - more at 
   PUNCTILIO] : the humorous use of a word in such a way as to suggest 
   different meaning s or applications or of words having the same or nearly 
   the same sound but different meanings
2. pun vi or punned;  or pun.ning : to make puns