Definitions of southerly:

• noun:   a wind from the south
• adjective:   from the south; used especially of wind

  Example: "The winds are southerly"

• adjective:   situated in or oriented toward the south

  Example: "Took a southerly course"

• adverb:   from the south

  Example: "A wind blew southerly"

• adverb:   toward the south

  Example: "The ship turned southerly"

• name:  A surname (very rare: popularity rank in the U.S.: #54116)