My definition: Dialectic is the two opposing arguments thrown at each
other to arrive at truth (subjects).
Now let's look wikipedia:
"The dialectical method is dialogue between two or more people holding
different points of view about a subject, who wish to establish the
truth of the matter by dialogue, with reasoned arguments.
Dialectics is different from debate, wherein the debaters are
committed to their points of view, and mean to win the debate, either
by persuading the opponent, proving their argument correct, or proving
the opponent's argument incorrect — thus, either a judge or a jury
must decide who wins the debate. Dialectics is also different from
rhetoric, wherein the speaker uses logos, pathos, or ethos to persuade
listeners to take their side of the argument."