- "Type" for the same reason that the term "set". A type in ontology modeling is a mathematical notion typically expressed at the meta-level (language). With this meaning, it should not be a term for ontological modeling.
- (different definition of "type" at the concept level. (entry specification suggested from Richard D.)
- Unique name assumption - Note: This is not a 'term' and has a fairly clear interpretation. Hence need not be in the this lexicon.
- In some contexts (e.g., BFO Specification 2.0) 'type' is synonymous with 'universal'.