What is an abstract noun?

An abstract noun is a noun describing something that can’t be directly perceived with the senses.

Abstract nouns may refer to general or philosophical concepts (e.g., “art,” “democracy,” “evidence”), emotions and personal qualities (e.g., “happiness,” “impatience”), time measurements (e.g., “hours,” “January”), or states of being (e.g., “solidity,” “instability”).

Abstract nouns are the opposite of concrete nouns, which refer to physical things that can be perceived with the senses: objects, substances, places, people and animals, and so on. For example, “window,” “Dorian,” and “sand.”