half note

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A note having one half the value of a whole note.

from The Century Dictionary.

• noun In musical notation, a note equivalent to one half of a whole note; a minim (as shown in figure).

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun US, music A musical note that is two beats long, which is half the length of a semibreve and equal in length to two crotchets; a minim.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a musical note having the time value of half a whole note