Definition

Noun: 1. The property of being a unique and individual thing; "thismess": In philosophy, particularly in scholastic and modern metaphysics, haecceity refers to the set of qualities that make a specific entity precisely this one and not another, even one of the same kind. It is the essence of individuality.

Usage

• Haecceity is a specialized philosophical term. It is used to discuss the principle of individuation—what accounts for the distinct existence of a particular entity.
• It is often contrasted with quiddity (the "whatness" or general essence of a type of thing). While quiddity answers "What is it?", haecceity answers "Which one is it?"

Examples

• "The philosopher argued that it was the object's , not just its material properties, that defined its unique existence."
• "Beyond its general 'dogness,' the specific of my pet makes him irreplaceable to me."
• "The debate centered on whether a person's identity is grounded in a persistent or a continuous narrative."

Advanced Usage

• Haecceitic difference: A distinction based purely on numerical difference (being one versus one) rather than a qualitative difference in properties.
• The concept is central to discussions in modal logic and metaphysics concerning identity, possible worlds, and the persistence of objects over time.

Variants and Related Words

• Haecceitism (noun): The metaphysical doctrine that holds haecceities are fundamental and real. A haecceitist believes facts about which particular individual is which are primitive and not reducible to qualitative facts.
• Haecceitistic (adjective): Pertaining to or characterized by haecceity or haecceitism.

Synonyms

• Thismess
• Individuality
• Singularity (in a metaphysical sense)
• Numerical identity

Antonyms

• Quiddity ("whatness")
• Generality
• Type
• Universality

Noun

1. the essence that makes something the kind of thing it is and makes it different from any other