It is common to hear discussions of whether something is moral or immoral, as if "moral" were a word with a specific, agreed-upon meaning. Unfortunately, the word has so many meanings that its interpretation is extremely difficult without extra information. For example, if I say "murder is immoral", I could actually mean any of the following: 1. Murder violates an abstract principle that I would like all people to live by. 2. The Bible (or some other religious text) forbids murder. 3. ...