Wordnet 3.0
NOUN (1)
1. 
 something determined in relation to something that includes it; 
- Example: "he wanted to feel a part of something bigger than himself"- Example: "I read a portion of the manuscript"- Example: "the smaller component is hard to reach"- Example: "the animal constituent of plankton"[syn: part, portion, component part, component, constituent]
WordNet (r) 3.0 (2006):
component part
    n 1: something determined in relation to something that includes
         it; "he wanted to feel a part of something bigger than
         himself"; "I read a portion of the manuscript"; "the
         smaller component is hard to reach"; "the animal
         constituent of plankton" [syn: part, portion,
         component part, component, constituent]