Definitions of special:

• noun:   a television production that features a particular person or work or topic

  Example: "The last of a series of BBC specials on Iran is being shown tonight"

• noun:   a special offering (usually temporary and at a reduced price) that is featured in advertising

  Example: "They are having a special on pork chops"

• noun:   a dish or meal given prominence in e.g. a restaurant
• adjective:   for a special service or occasion

  Example: "A special correspondent"

• adjective:   adapted to or reserved for a particular purpose

  Example: "A special kind of paint"

• adjective:   first and most important

  Example: "His special interest is music"

• adjective:   added to a regular schedule

  Example: "A special holiday flight"

• adjective:   having a specific function or scope

  Example: "A special (or specific) role in the mission"

• adjective:   surpassing what is common or usual or expected

  Example: "He paid especial attention to her"