Gram.
1. a noun denoting something immaterial and abstract, as rest, dread, or transportation.
2. a noun formed with a suffix that imparts such a meaning, as kindness. Cf. concrete noun.
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a noun that refers to a quality, idea, or feeling rather than to a person, animal, place, or thing
Thesaurus: types and forms of nounshyponym
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abstract noun,
a common noun that refers to a quality, idea, action, or state, rather than to a physical object, tangible thing, or specific being. Youth is an abstract noun in “the vigor of youth,” a collective noun in “the youth of our country,” and a concrete noun in “a youth.”
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a noun, for example goodness or freedom, that refers to an idea or a general quality, not to a physical object
Useful english dictionary. 2012.