Definitions of off:

• adjective:   not in operation or operational

  Example: "The oven is off"

• adjective:   (of events) no longer planned or scheduled

  Example: "The wedding is definitely off"

• adjective:   below a satisfactory level

  Example: "An off year for tennis"

• adjective:   in an unpalatable state
• adverb:   no longer on or in contact or attached

  Example: "Clean off the dirt"

• adverb:   at a distance in space or time

  Example: "The boat was 5 miles off (or away)"

• adverb:   from a particular thing or place or position (`forth' is obsolete)

  Example: "Went off to school"

• name:  A surname (very rare: popularity rank in the U.S.: #69521)