Definitions of routine:

• noun:   an unvarying or habitual method of procedure
• noun:   a set sequence of steps, part of larger computer program
• noun:   a short theatrical performance that is part of a longer program

  Example: "She had a catchy little routine"

• adjective:   occurring at fixed times or predictable intervals

  Example: "Made her routine trip to the store"

• adjective:   found in the ordinary course of events

  Example: "It was a routine day"