An Invariant Content Theory for Epistemic Uses of Modal Terms

I propose and defend an account on which the semantic content of propositions expressed by utterances making use of modals epistemically is constant; i.e., invariant. Although such proposals are typically considered non-starters, I aim to show that combining such a semantics with a performative account in which such utterances perform two speech acts is quite promising. I argue that a performative account, when combined with an invariant semantic content theory, does a good job of accounting for ordinary intuitions in some of the standard test cases discussed in the literature. I further show that the contextualist has a little noticed problem with how a single speaker is able to consider the same epistemic possibility proposition over time. An invariant position has no such problem, and I argue that this counts strongly in its favor.