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321Relative Interpretations and Substitutional Definitions of Logical Truth and ConsequenceIn Martin Blicha & Igor Sedlar (eds.), The Logica Yearbook 2019, College Publications. 2020.This paper proposes substitutional definitions of logical truth and consequence in terms of relative interpretations that are extensionally equivalent to the model-theoretic definitions for any relational first-order language. Our philosophical motivation to consider substitutional definitions is based on the hope to simplify the meta-theory of logical consequence. We discuss to what extent our definitions can contribute to that.