acidity
(logic) Having a false basis.
(linear algebra) A method of reducing an augmented matrix to reduced row echelon form.
(historical) A child's toy consisting of a notched disc that spins rapidly with a whizzing noise when its attached string is pulled.
The quality or state of being acid. / Sourness; tartness; sharpness to the taste. / (pathology) Excessive acid quality, as in gastric secretions.
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