Etymology
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sourness (n.)

Old English surnes; see sour (adj.) + -ness.

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Definitions of sourness

sourness (n.)
the taste experience when vinegar or lemon juice is taken into the mouth;
Synonyms: sour / tartness
sourness (n.)
the property of being acidic;
Synonyms: sour / acidity
sourness (n.)
a sullen moody resentful disposition;
Synonyms: sulkiness / sullenness / moroseness
From wordnet.princeton.edu