What is "acalculia"

n. (context pathology English) The condition of lack basic mathematics skills caused by a brain injury, or more specifically an injury to the parietal lobe. (First attested in the early 20th century.)Brown, Lesley, ed. ''The Shorter Oxford English Dictionary.'' 5th. Oxford: Oxford University Press, 2003.

Acalculia (not to be confused with dyscalculia) is an acquired impairment in which patients have difficulty performing simple mathematical tasks, such as adding, subtracting, multiplying and even simply stating which of two numbers is larger. Acalculia is distinguished from dyscalculia in that acalculia is acquired late in life due to neurological injury such as stroke, while dyscalculia is a specific developmental disorder first observed during the acquisition of mathematical knowledge. The name comes from the Greek "a" meaning "not" and Latin "calculare", which means "to count".