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[koun-tuh-buh l] /ˈkaʊn tə bəl/
able to be counted.
  1. (of a set) having a finite number of elements.
  2. (of a set) having elements that form a one-to-one correspondence with the natural numbers; denumerable; enumerable.
Origin of countable
1400-50; late Middle English. See count1, -able
Related forms
countability, countableness, noun
countably, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for countable
Historical Examples
  • While this poor Friedrich-Wilhelm sphere is perhaps still a countable quantity.

  • My two boys and son-in-law are off with the South, but I'm not 'countable for them.

    Red-Tape and Pigeon-Hole Generals William H. Armstrong
  • The lightning came, in one of those broad, sheetlike flickers that seem to irradiate the world for countable seconds.

    The Flying Death Samuel Hopkins Adams
  • If I'm to be held 'countable he doesn't live here no longer; I know that much.'

    Demos George Gissing
  • They are countable by the thousand and the million; who have suffered cruel wrong.

    The French Revolution Thomas Carlyle
  • Bemebibi, chief of the Lesser Isisi, was too fat a man for a dreamer, for visions run with countable ribs and a cough.

    Bones Edgar Wallace
  • But these were a minority always, generally a very small one, often so small a one as to be countable on the fingers of your hand.

    Tom Brown's School Days Thomas Hughes
  • This was not sufficient, because though visible not sufficiently tangible, countable, and tariffable.

British Dictionary definitions for countable


capable of being counted
(maths, logic) able to be counted using the natural numbers; finite or denumerable
(linguistics) denoting a count noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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countable in Technology

A term describing a set which is isomorphic to a subet of the natural numbers. A countable set has "countably many" elements. If the isomorphism is stated explicitly then the set is called "a counted set" or "an enumeration".
Examples of countable sets are any finite set, the natural numbers, integers, and rational numbers. The real numbers and complex numbers are not [proof?].

The Free On-line Dictionary of Computing, © Denis Howe 2010
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