If the truth-conditional content of a sentence is always fully determined relative to a rich, occasion-specific context, then introducing circumstances as a second index is a theoretical posit that violates Occam's razor.

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Circumstances (in philosophy)(in semantics and modal logic): The objective features of the world at a given time and place—like whether it's raining, what objects exist, and what properties they have.
Context (in philosophy of language)(in semantics): The specific details of a situation in which words are spoken—like who's speaking, when, where, and what they're pointing at—that affect what those words actually mean.
Index (or indexical)(in semantics and formal philosophy): In philosophy, a way of keeping track of different factors (like time, place, or perspective) that can change how we evaluate whether something is true.
Occam's Razor(Philosophy of science): A principle favoring more ontologically parsimonious theories over less parsimonious ones.
Occasion-specific(in philosophy of language): Depending on the particular time, place, and circumstances of a specific moment or event.
Theoretical posit(in philosophy of science and metaphysics): An assumption or thing you propose to exist in your theory in order to explain something, even though you can't directly observe it.
Truth-conditional content(in semantics and philosophy of language): The meaning of a sentence defined by the specific conditions under which that sentence would be true or false.

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