Definitions:

1. A philosophical term that refers to the discrete qualities, properties, or characteristics that make an individual entity uniquely itself and distinguishable from all other entities. NOUN
   • Philosophers debate whether haecceity is inherent to an object or simply a construct of human perception.
2. The essence that makes something the kind of thing it is and makes it different from any other. NOUN
   • Each snowflake's intricate pattern exemplifies its haecceity, making it as distinct from every other.

Synonyms:

• essence
• identity
• individuality
• singularity
• Uniqueness