Abstract: This chapter gives a general characterization of the notion of logical form in the light of the truth-theoretic, and then generalized fulfillment-theoretic, approach to natural language semantics. The chapter takes logical form to be semantic form. It explicates the notion of sameness of logical form by making use of the idea of corresponding canonical proofs of appropriate theorems for the sentences in interpretive truth or fulfillment theories for their languages. The chapter discusses also briefly the issue of the identification of logical constants in the language in the light of the semantic framework it employs, and some issues having to do with the extension of the notion of logical validity and logical consequence to natural languages.

Keywords: semantic form, logical constants, logical validity, logical consequence,