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[Term] Acidity [Definition] 
The quality of wine that gives it its crispiness and vitality. A proper balance of acidity must be struck with the other elements of a wine, or else the wine may be said to be too sharp - having disproportionately high levels of acidity - or too flat - having disproportionately low levels of acidity. A wine's acidity should be detectable as a sharpness in the mouth, particularly around the front sides of the tongue. It should be neither too obvious nor absent. It provides a refreshing sensation in white wines, and balance in reds. Its absence makes a wine dull and 'flabby' - a defect in any wine, but a disaster in sweet wines which to me become undrinkable without balancing acidity. Too much acidity can make a wine difficult to drink. There are many acids in a wine, but the principle ones are acetic, malic, tartaric, lactic, citric and carbonic acid.
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