Wordnet 3.0
NOUN (1)
1. 
 one of two equal parts of a divisible whole; 
- Example: "half a loaf"- Example: "half an hour"- Example: "a century and one half"[syn: one-half, half]
The Collaborative International Dictionary of English v.0.48:
one-half \one-half\ n.
   one of two equal parts of a divisible whole; a half; a
   century and one half.
   Syn: half.
        [WordNet 1.5] one-hand
WordNet (r) 3.0 (2006):
one-half
    n 1: one of two equal parts of a divisible whole; "half a loaf";
         "half an hour"; "a century and one half" [syn: one-half,
         half]