Mr (UK) or Mr. (USA) is an English honorific use for a man too old to be addressed as Master, under the rank of knighthood, and, supposedly, though not really in practice, above some undefined level of social status (see below). In Britain, though not in the United States, the title also excludes those who have the title Dr. It is an abbreviation of Mister, though it is almost never spelt out in normal usage. The plural of Mr is Messrs (IPA pronunciation: ['mesÉ™(r)z]), an abbreviation for the French messieurs.