Ambiguity refers to unclear, vague, or double meanings in language. Lawyers try to avoid ambiguity in contracts by making language very precise, but this can make contracts difficult for non-lawyers to understand. Ambiguity can also refer to moral dilemmas where it is unclear which of two options is right or wrong, such as whether to help a friend who asks you to cheat. Examples are given of ambiguous sentences that could have more than one interpretation and discussions of ambiguity in historical agreements, personal letters, and uses of the term "gene".