noun
1. : a theory of the evolution of a celestial body that is based on the action of tidal forces ; specifically : such a theory explaining the moon's evolution
2. : the theory of the present ocean tides
noun
1. : a theory of the evolution of a celestial body that is based on the action of tidal forces ; specifically : such a theory explaining the moon's evolution
2. : the theory of the present ocean tides
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012