Webster's English Dictionary

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introduction

in.tro.duc.tion \.in-tr*-'d*k-sh*n\ n [ME introduccioun act of introducing, 
   fr. MF introduction, fr. L Xintroduction-, introductio, fr. introductus, 
   pp. of introducere 1: something that introduces : as  1a1: a part of a book 
   or treatise preliminary to the main portion  1a2: a preliminary treatise or 
   course of study  1b: a short introductory musical passage  2: the act or 
   process of introducing or the state of being introduced  3: a putting in : 
   INSERTION  4: something introduced; specif : a new or exotic plant or 
   animal