theoretical/͵θiəˋrɛtIkḷ; θIəˈretIk$l/adj 1 relating to scientific ideas rather than practical situations〔科学〕理论的: a good theoretical understanding of physics 对物理理论的透彻理解2 a theoretical situation could exist but does not exist yet 理论上的﹔推想的﹐假设的: There is a theoretical risk of an explosion. 理论上有爆炸的危险。