Definitions of aid:

• noun:   the activity of contributing to the fulfillment of a need or furtherance of an effort or purpose

  Example: "Rescue party went to their aid"

• noun:   a resource

  Example: "Visual aids in teaching"

• noun:   a gift of money to support a worthy person or cause
• noun:   the work of caring for or attending to someone or something
• verb:   improve the condition of
• verb:   give help or assistance; be of service
• name:  A surname (very rare: popularity rank in the U.S.: #88692)