WATERPOWER Meaning of WATERPOWER in English ˈ ̷ ̷ ̷ ̷ˌ ̷ ̷ noun 1.a. : the power of water employed to move machineryb. : a fall of water suitable for such use2. : a water privilege for a mill Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012