noun
: the immediate agent in the production of an effect
I have a free morning, and this is the efficient cause of the chance for talk with you — H.J.Laski
noun
: the immediate agent in the production of an effect
I have a free morning, and this is the efficient cause of the chance for talk with you — H.J.Laski
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012