haecceity (n)

Latin: “thisness”

From Wikipedia:

“Haecceity” (/hɛkˈsiːɪti, hiːk-/; from the Latin haecceitas, which translates as “thisness”) is a term from medieval scholastic philosophy, first coined by followers of Duns Scotus to denote a concept that he seems to have originated: the discrete qualities, properties or characteristics of a thing that make it a particular thing. Haecceity is a person’s or object’s thisness, the individualising difference between the concept “a man” and the concept “Socrates” (i.e., a specific person).

Not to be confused with “quiddity,” which is a thing’s whatness.

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attosecond

(n).

The smallest measurement of time available to science so far.  Atto + second, atto meaning “18,” referring to the exponent describing fraction:

1×1018 of a second

Or one quintillionth of a second.

hypostatize (v)

verb (used with object), hypostatized, hypostatizing.

1. to treat or regard (a concept, idea, etc.) as a distinct substance or reality.

A very useful word for New Materialism / Object Oriented Ontology / Speculative Realism.