Noun

1. Mr., mister, sir
2. gentleman

   Meine Damen und Herren = Ladies and gentlemen

3. master, lord (old fashioned)
4. Lord, God

   Das Haus des Herrn = The House of God

5. Very often used as a title of respect that is not translated into English:

   Herr Schmidt = Mr. Schmidt; but:

   Herr Doktor von Braun = Dr. von Braun

   Herr Professor = Dr. (Ph.D.); professor

   Jawohl, Herr Oberst! = Yes, sir! (enlisted man to a colonel)

   Ja, mein Herr. = Yessir. (standard usage between strangers)

   After supper Frau Brechenmacher packed four of the five babies to bed, allowing Rosa to stay with her and help to polish the buttons of Herr Brechenmacher's uniform. - "Frau Brechenmaster Attends A Wedding", from "Selected Short Stories" by Katherine Mansfield (first published in 1910)