Definitions of closing:

• noun:   approaching a particular destination; a coming closer; a narrowing of a gap

  Example: "The ship's rapid rate of closing gave them little time to avoid a collision"

• noun:   the act of closing something
• noun:   a concluding action
• noun:   termination of operations
• noun:   the last section of a communication
• adjective:   final or ending

  Example: "The closing stages of the election"