Wordnet 3.0
VERB (1)
1. 
 wipe out the effect of something; 
- Example: "The new tax effectively cancels out my raise"- Example: "The `A' will cancel out the `C' on your record"[syn: cancel out, wipe out]
WordNet (r) 3.0 (2006):
cancel out
    v 1: wipe out the effect of something; "The new tax effectively
         cancels out my raise"; "The `A' will cancel out the `C' on
         your record" [syn: cancel out, wipe out]