Intension

Intension refers to the meaning or concept of a term, including its defining properties and attributes, while extension refers to the set of all objects in the world that the term denotes or applies to. For example, the intension of “planet” is a “major celestial body that orbits a star,” and its extension is the set of planets in our solar system: Earth, Mars, Jupiter, etc.

Feature	Intension	Extension
Definition	The intrinsic meaning, concept, or formal definition of a term.	The class or set of all objects that the term refers to in the real world.
Focus	The “what” and “why”—the attributes and conditions that make something a member of a class.	The “who” and “which”—the actual individual things that fit the definition.
Example: “Square number”	The concept “a number that is the square of an integer”.	The set {0, 1, 4, 9, 16, …}.
Example: “Automobile”	A vehicle powered by an engine, used for travel, with four wheels, etc.	The actual cars in the world, like a specific Ford F-150 or a specific Toyota Camry.
Example: “Planet”	A celestial object that orbits a star.	The eight planets in our solar system (Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune).

AI responses may include mistakes.

[1] https://fiveable.me/key-terms/introduction-semantics-pragmatics/intensional-vs-extensional

[2] wikipedia/en/Extensional_and_intensional_definitions

[3] https://www.britannica.com/topic/intension

[4] youtube/v=KFSse9RE4hE

[5] youtube/v=WWb2XH9AIWE

[6] youtube/v=zMFylDEw1pc

[7] https://www.reddit.com/r/askphilosophy/comments/1do2ofp/intension_and_extension/

Intension

Feature	Intension	Extension
Definition	The intrinsic meaning, concept, or formal definition of a term.	The class or set of all objects that the term refers to in the real world.
Focus	The “what” and “why”—the attributes and conditions that make something a member of a class.	The “who” and “which”—the actual individual things that fit the definition.
Example: “Square number”	The concept “a number that is the square of an integer”.	The set {0, 1, 4, 9, 16, …}.
Example: “Automobile”	A vehicle powered by an engine, used for travel, with four wheels, etc.	The actual cars in the world, like a specific Ford F-150 or a specific Toyota Camry.
Example: “Planet”	A celestial object that orbits a star.	The eight planets in our solar system (Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune).