The article raises the issue of the relationship between Hilary Putnam’s externalist semantics, with a focus on the concepts of deixis and deictic (ostensive) definition, and Robert B. Brandom’s semantic inferentialism, with a focus on the concepts of observational, noninferential reports and of anaphoric reference and their roles in a broader inferential practice. The analysis of the two respective conceptions shows that despite the differences in philosophical background and terminology, Putnam’s and Brandom’s considerations largely overlap as to their views on (...) reference and ostensive definition, especially in the context of introducing a novel term into a language by a scientist. Either philosopher agrees, first, that the bare act of indicating does not play any semantically constitutive role unless it has some conceptual load and it is used in a sentence, at least such as “This is X”; second, in their accepting semantic holism; third, in their admitting the social aspect of meaning-formation, along with their approving that the constituting of meaning of perceptual, observational terms proceeds in close contact of the language with reality. (shrink)