Distinction by contrast; the provision of one example against which another example may be defined. / The quality of being contradistinctive.

(medicine) A factor or symptom which makes a certain treatment inadvisable, generally or individually.

To deny the truth or validity of (a statement or statements). / To oppose (a person) by denying the truth or pertinence of a given statement. / To be contrary to (something).

(literary) in the contrary or opposite way, order, or direction / (literary) on the other hand

The act of contravening a rule, regulation, or law, or of not fulfilling an obligation, promise, or agreement.

(uncountable) The degree of this difference. / (countable) A control on a television, etc, that adjusts the amount of contrast in the images being displayed.

(transitive) To set in opposition in order to show the difference or differences between. / (intransitive) To form a contrast.

That acts to prevent conception as a result of sexual intercourse.

A mechanism or means by which conception as a result of sexual intercourse can be prevented or made less likely.

(uncountable) Any goods which are illicit or illegal to possess. / (uncountable) Goods which are prohibited from being traded, smuggled goods.