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- This thing has its own distinct nature; this thing is itself.
- This circumstance is simply a fact and must be accepted or dealt with as it exists.
Sorry, no etymologies found.
In the general doctrine of St. Thomas, the individual — "this thing" (hoc aliquid) — is a primordial substance, individualized by the fact that it is what it is ( "Substantia individuatur per seipsam": Summa, Pars