This paper explores a theory of the meaning-form relation based on ranked and violable constraints [A. Prince, P. Smolensky, 1993. Optimality Theory: Constraint Interaction in Generative Grammar, Rutgers University, New Brunswick, and University of Colorado, Boulder], using the English genitive construction as a testing ground. Our main thesis is that partially ordered optimality-theoretic grammars allow us to relate four apparently independent empirical phenomena: (i) categorical grammaticality contrasts; (ii) variation and preferences in expression; (iii) ambiguity and preferences in interpretation; (iv) lexical organization. #