Definitions of westerly:

• noun:   the west-to-east winds that occur in the temperate zones of the Earth
• adjective:   of wind; from the west
• adjective:   lying in or toward the west
• adjective:   moving toward the west
• adverb:   from the west

  Example: "The wind blew westerly"

• adverb:   toward the west

  Example: "We began to steer away westerly- Daniel Defoe"