Wordnet 3.0
NOUN (1)
1. 
 a period of time containing 365 (or 366) days; 
- Example: "she is 4 years old"- Example: "in the year 1920"[syn: year, twelvemonth, yr]
WordNet (r) 3.0 (2006):
yr
    n 1: a period of time containing 365 (or 366) days; "she is 4
         years old"; "in the year 1920" [syn: year, twelvemonth,
         yr]