Abstract and Concrete

The referents of our concepts are concrete; each is a single, individual object.

A concept is abstract because it:

1. refers to a group of objects, not just to a single thing;
2. groups together things that differ from one another. Things are grouped together, not because they are identical, but because they are similar in some respect.

Lassie (as the name of a specific dog) refers to a concrete object, whereas the concept DOG is abstract because it refers to a group of objects that are similar in certain respects.

Example:

Lassie (as the name of a specific dog) refers to a concrete object, while the concept DOG is abstract because it refers to a group of objects that are similar in certain respects.


Order of Increasing Abstractness

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