Definition of "dialectician"

(chiefly historical) Someone skilled in dialectics: someone able to arrive at logical conclusions through reasoned argument.

(Hegelianism) Someone skilled in dialectical idealism: someone able to arrive at historical conclusions through consideration of contradictions.  examples

(Marxism) Someone skilled in dialectical materialism: someone able to arrive at socio-political conclusions through consideration of class differences.  examples

Someone knowledgeable about dialects.  examples