dynamism

/ˈdaɪnəmɪzəm; ˋdaɪnəˏmɪzəm/ n [U]
1 (in a person) quality of being dynamic （人的）精力, 活力, 干劲.
2 (philosophy 哲) theory that phenomena are the result of natural forces acting on each other 物力论（认为一切现象都是自然力相互作用的结果之理论）.