Definitions

Discourses
A discussion of a subject.
To communicate thoughts orally;words;talk;conversation.

Binary Opposition
A system where in language and thought, a pair of terms or concepts that theoretically opposites are strictly defined and set off against one another.
A pair of distinctive features, one is absence of the other or that one is opposite from the other.
E.g. voice and voicelessness, stridency and mellowness

Ideologies 
ideas and ideals that forms the basis of economic or political policy.
ideas and way of thinking of a particular person, group, community, social class.
A set of ideas of one's expectations, a way of looking at things or a set of ideas proposed by the dominant class of a society to all members of this society.