What is "privative term"

Privative \Priv"a*tive\, n.

1. That of which the essence is the absence of something.

   Blackness and darkness are indeed but privatives.
   --Bacon.

2. (Logic) A term indicating the absence of any quality which might be naturally or rationally expected; -- called also privative term.

3. (Gram.) A privative prefix or suffix. See Privative, a., 3.