"The second is defined by the caesium-133 hyperfine transition frequency"
The SI second is defined by the caesium-133 hyperfine transition frequency of 9192631770 Hz.
Warrant (how it is justified) and consensus state / credence (where the community stands) are independent axes. The four warrant kinds are unordered peers — not a certainty ladder.
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⚑ held by convention · challengeableThis claim has no dependencies — the drill terminates here. Not because bedrock was reached, but because this is where the community currently agrees to stop digging. It is epistemically identical to every other node: held by convention, and challengeable.
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Answer
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Since the 2019 SI redefinition, the second is defined by taking the fixed numerical value of the caesium frequency Δν_Cs, the unperturbed ground-state hyperfine transition frequency of the caesium-133 atom, to be 9192631770 when expressed in the unit Hz, which is equal to s^{-1}.
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