This thesis compares truth relativism with non-indexical contextualism. These views are compared both as general approaches to account for the use of a linguistic expression in declarative sentences and as proposals about particular expressions such as personal taste, aesthetic and moral predicates, epistemic modals, knowledge ascriptions and future contingents. Four aims are set forth: (i) to show that truth relativism must be understood as an account of the assessment sensitivity of our ordinary monadic truth notion, (ii) to single out a problem this view faces to make sense of its non-monadic truth notion and identify the best strategy to solve it, (iii) to argue that, with the exception of future contingents, this strategy cannot be app...