noun Psychiatry.
inability or loss of the ability to perform arithmetic operations.

< Neo-Latin, equivalent to a- a-6 + calcul- (see calculate) + -ia -ia Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
acalculia (ˌækælˈkjuːlɪə)
psychol an inability to make simple mathematical calculations
[C20: from a-1 + Latin calculāre to calculate]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

acalculia a·cal·cu·li·a (ā'kāl-kyōō'lē-ə)
A form of aphasia characterized by the inability to perform mathematical calculations.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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