  Gupta and Belnap's suggestions, concerning the signification of T and the interpretation of the ‘iff’ in the T-biconditionals, dovetail nicely with two closely related intuitions articulated in Gupta &amp; Belnap 1993. The first intuition, loosely expressed, is “that the T-biconditionals are analytic and fix the meaning of ‘true’” (p. 6). More tightly expressed, it becomes the “Signification Thesis” (p. 31): “The T-biconditionals fix the signification of truth in every world [where a world is represented by a ground  model].”[6]  Given the revision-theoretic treatment of the definition ‘iff’, and given a ground model M, the T-biconditionals (10) do, as noted, fix the suggested signification of T, i.e., the revision rule τM.