马克思、恩格斯所创立的建立在彻底的唯物主义基础上的辩证法。唯物辩证法认为物质世界本身有着自己的辩证运动规律,任何事物都是处在普遍联系和相互作用之中;任何事物都有它产生、发展和灭亡的过程;事物发展的根本原因在于事物内部的矛盾性,矛盾着的对立面又统一又斗争,由此推动事物的运动和变化。对立统一规律,是唯物辩证法的实质和核心。

Materialist dialectics; dialectics established by Marx and Engels on the basis of absolute materialism. According to materialist dialectics, the material world has its own dialectic law of motion; everything is in relation with and under the influence of everything else; everything has its own process of origin, development and end; the basic cause for the development of a thing is its internal contradiction. It is the opposing sides of a contradiction, both unified and opposite, that promote the motion and development of things. The law of the unity of opposites is the essence and core of materialist dialectics.

矛盾论
中文：https://www.marxists.org/chinese/maozedong/marxist.org-chinese-mao-193708.htm
英文：https://www.marxists.org/reference/archive/mao/selected-works/volume-1/mswv1_17.htm