| Definition -
A noun that labels an idea, a quality, an attribute, or a condition, i.e. things that cannot be perceived by the senses, e.g. Judaism, anger, width, knowledge, and strength
As opposed to concrete nouns which denote any object that can be perceived by the senses.
Oxford English Dictionary - The only citation I could find for the term was from 1876:
"Abstract nouns are sometimes used in the concrete sense … Thus nobility frequently means the whole body of persons of noble birth."
(Mason Eng. Gram. §35)