What use has approved

The meaning of a word is given by a customary rule for its use. I defend that claim and explain its implications by a comparison with customary rules in law. I address two problems about customary rules: first, how can the mere facts of social practice yield a norm? Secondly, how can we explain disagreement about the requirements of a custom, if those requirements are determined by the shared practice of the participants in a community? These problems can be resolved in a way that illuminates customary rules, and helps to explain the relation between the meaning of a word and the customary rule for its use. The meaning of a word is the usefulness that it has because of the customary rule for its use.