If the behavior of rods and clocks is fully governed by relativistically well-formed laws, the ill-definedness objection conflates the instrument with the underlying physical process it instantiates.

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Conflates(in argumentation and logic): Treats two different things as if they're the same thing, or mixes them up in a way that causes confusion.
ill-definedness objection(philosophy of science and measurement): A philosophical criticism that claims something is unclear or poorly defined—in this case, the objection argues that measuring instruments aren't clearly defined.
instantiates(as used in metaphysics): To instantiate means to be a specific example or instance of something more general. For example, a red apple instantiates the property 'redness.'
relativistically well-formed laws(physics and philosophy of science): Physical rules that follow the principles of relativity (Einstein's theory that space and time are connected and relative to the observer), stated in a mathematically correct way.

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