count·a·ble

[koun-tuh-buhl]
adjective
1.
able to be counted.
2.
Mathematics.
a.
(of a set) having a finite number of elements.
b.
(of a set) having elements that form a one-to-one correspondence with the natural numbers; denumerable; enumerable.

Origin:
1400–50; late Middle English. See count1, -able

count·a·bil·i·ty, count·a·ble·ness, noun
count·a·bly, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
countable (ˈkaʊntəbəl) [Click for IPA pronunciation guide]
 
adj
1.  capable of being counted
2.  maths, logic able to be counted using the natural numbers; finite or denumerable
3.  linguistics denoting a count noun

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Countable is always a great word to know.
So is callithumpian. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
FOLDOC
Computing Dictionary

countable definition

mathematics
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?].
(1999-08-29)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
Other personal property may be a countable resource.
Both earned and unearned incomes, less mandatory deductions, are countable with
  few exceptions.
To be eligible for the subsidy, an individual, or couple must have countable
  income below certain limits prescribed by the law.
The payment for a month is generally based on your countable income from the
  second month before the current month.
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