aid

Dictionary definition · aid

a person or thing that is a resource that helps make something easier or possible to do"visual aids in teaching"
the activity of contributing to the fulfillment of a need or furtherance of an effort or purpose"he gave me an assist with the housework"
gift of money or other material help to support a person or cause"economic assistance to depressed areas"
the work of providing treatment for or attending to someone or something"no medical care was required"

give help or assistance; be of service"Everyone helped out during the earthquake"
improve the condition of"These pills will help the patient"

Source: Open English WordNet (CC BY 4.0).