dialectics?

Answer 1

I'm tempted to give you an insider's one-word answer, like 'rhetorics'.

But I guess you're asking what it is?

It's one type of epistemology.

When we're considering ways that people discover truth, we find lots of potential epistemologies, including:
empiricism
scripture
inspiration (divine or mundane)
rhetoric
experience
authority
tradition/precedent
altered states of consciousness

Dialectic is one such way of knowing; in dialectic, you engage in an insightful discussion/debate about a question. Eventually, a realization of truth is supposed to emerge.

Now, dialectic is also used in the sense of "dialectic opposites", that is, when two things are truly the opposite of one another: black-white, point-infinity, acid-alkaline, combustible-inert. Not to be confused with perceptual opposites like male-female or hot-cold, which are actually variations on the same thing.

Answer 2

A rationale for dialectical materialism based on change through the conflict of opposing forces

Answer 3

1a. A regional variety of language distinguished by features of vocabulary,grammar, and pronunciation from other regional varieties and constituting together with them a single language of which no one variety is construed as standard

1b. One of two or more cognate languages

1c. a regional variety of a language usu. transmitted orally and differing distinctively from the standard language

1d. a variety of a language used by the members of an occupational group< the--of the atomic physicist>

1e. a variety of language whose identity is fixed by a factor ( as social class or educational level of its habitual users) other than geography

2: manner or means of expressing oneself