tautologythat

Tautologythat is a neologism used in logic and philosophy of language to describe a sentence or proposition in which truth is guaranteed by a tautological component expressed through a that-clause. The term combines tautology with the English that-clause, signaling a syntactic frame that reports or foregrounds a tautologically true content. It is not a standard term in formal literature but appears in discussions of redundancy, meta-language, and the structure of arguments.

In formal logic, a tautologythat refers to a statement of the form That P, where P is itself a propositional tautology (for example, P being p → p). Since P is always true, the overall sentence inherits truth from P, regardless of the specific content of p. Thus "That p → p is true" can be treated as a tautologythat illustrating how a that-clause can carry a tautological claim without adding substantive information.

In linguistic and rhetorical analysis, tautologythat describes sentences where the that-clause redundantly repeats the asserted content, producing a statement that is logophorically present but semantically trivial. Critics often view such constructions as examples of redundancy rather than informative communication, though they can illuminate how language encodes logical certainty.

Etymology: the term is a blend of tautology and that, reflecting the combination of a logical form with a reporting clause. It has appeared mainly in online glossaries and speculative discussions rather than as a formal category in mainstream logic or linguistics.

See also: tautology, logical truth, redundancy, meta-language.