Medieval logicians distinguished ampliation, whereby tensed or modal contexts expand reference beyond present existents, as a necessary condition for validinference across temporal gaps.
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Sentences or statements that involve time—like talking about what happened yesterday or what will happen tomorrow—rather than just what's happening right now.
ampliation(Medieval logic; applies to past-tense verbs, modal verbs, and certain other linguistic contexts)
The extension of the subject of a proposition beyond presently existing supposita to include past, future, possible, or merely intelligible supposita
reference(Distinguished from intension in the context of possible worlds semantics)
The actual-world referent of an expression; what the expression picks out in the actual world.
valid inference(Used within informal logic's definition of a good argument)