To express approval, especially by clapping the hands.
To express approval of (someone or something) especially by such clapping.
To commend highly; praise: applauded her decision to complete her degree.
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.