The quality or state of being acid; the degree of acid content in a substance. Can also refer to sharpness or harshness in speech, manner, or taste.
From French acidité, from Latin acidus meaning 'sour, sharp' + -ity. The Latin root comes from acere 'to be sharp,' related to acer 'sharp.' The figurative sense of harsh temperament parallels the physical sensation of sourness.
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