Definitions of possible:

• noun:   something that can be done

  Example: "Politics is the art of the possible"

• noun:   an applicant who might be suitable
• adjective:   capable of happening or existing

  Example: "A breakthrough may be possible next year"

• adjective:   existing in possibility

  Example: "Possible uses of nuclear power"

• adjective:   possible to conceive or imagine

  Example: "That is one possible answer"