Definitions of positive:

• noun:   a film showing a photographic image whose tones correspond to those of the original subject
• adjective:   characterized by or displaying affirmation or acceptance or certainty etc.

  Example: "A positive attitude"

• adjective:   greater than zero

  Example: "Positive numbers"

• adjective:   indicating existence or presence of a suspected condition or pathogen

  Example: "A positive pregnancy test"

• adjective:   having a positive electric charge

  Example: "Protons are positive"

• adjective:   formally laid down or imposed

  Example: "Positive laws"

• adjective:   involving advantage or good

  Example: "A plus (or positive) factor"

• adjective:   granting what has been desired or requested

  Example: "A positive answer"

• adjective:   of or relating to positivism

  Example: "Positive philosophy"

• adjective:   marked by excessive confidence

  Example: "The less he knows the more positive he gets"

• adjective:   impossible to deny or disprove

  Example: "Proof positive"