Diinfinitive

Diinfinitive is a term sometimes encountered in theoretical linguistics to describe a construction in which two infinitival verb forms appear in close syntactic proximity within a single predicate. The label combines di- meaning two and infinitive, signaling that the semantic or syntactic load of more than one infinitival form is being expressed in tandem. The term is not part of standard reference grammars, and there is no universally accepted definition or typology.

In proposed analyses, a diinfinitive may arise in varying realizations depending on the language. One account envisions a chained sequence where one infinitive governs or licenses another, creating a layered verb meaning without introducing a finite verb form. A contrasting account imagines a bound di-prefix or a dedicated infinitival marker that attaches to an auxiliary or main verb to signal additional modality, aspect, or purpose. These possibilities place diinfinitives in the continuum between serial verb constructions, complex infinitival complements, and periphrastic constructions.

Semantically, diinfinitives are discussed as tools for encoding composite meanings that would otherwise require additional finite morphology or auxiliary verbs. Potential functions cited in theoretical discussions include marking intention or obligation alongside a subsequent action, expressing purpose together with aspectual nuance, or signaling a sequence of actions in a single verbal footprint. Because explicit and widely accepted demonstrations are scarce, current work treats diinfinitives as a diachronic or cross-linguistic hypothesis rather than a widespread, well-attested phenomenon.

See also: Infinitive, double infinitive, infinitival clause, serial verbs, periphrasis.