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

  • noun A pattern of smooth, regular electrical oscillations in the human brain that occur when a person is awake and relaxed. As recorded by the electroencephalograph, alpha waves have a frequency of 8 to 13 hertz.

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

  • noun neurology An electrical signal produced by the brain while the subject is relaxed.

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

  • noun the normal brainwave in the electroencephalogram of a person who is awake but relaxed; occurs with a frequency of 8-12 hertz


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