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Longman Dictionary of Contemporary English
abstract noun
▪ But introducing an abstract noun is not the same thing as providing an explanation.
abstract noun

n. (context grammar English) A noun that denotes an idea, emotion, feeling, quality or other abstract or intangible concept, as opposed to a concrete item, or a physical object.

Usage examples of "abstract noun".

Perhaps the most important single step in the whole history of writing was the Sumerians' introduction of phonetic representation, initially by writing an abstract noun (which could not be readily drawn as a picture) by means of the sign for a depictable noun that had the same phonetic pronunciation.

Government is an abstract noun meaning the an and process of governing and it should be an offence to write it with a capital G or so as to refer to people.

The present infinitive of any verb can be transformed into an abstract noun.