Definition of "reckoner" []

• A handbook of mathematical tables used to facilitate computation. (noun)

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.

• "new Radiohead video:: "reckoner" winning animated video for "Reckoner," chosen by the band as the song's official video."
• "THERE are some stories that have to be true - the sort that cannot be fabricated by a ready fiction-reckoner."
• "Twitter, that unreliable but swift ready reckoner of public emotion, faltered."