Would an API be defined as "A set of functions that define the available operations common to that set?" If so, would those functions then delegate to progressi

Would an API be defined as "A set of functions that define the available operations common to that set?" If so, would those functions then delegate to progressively more concrete functions that work against data structures to perform their duties? I suppose it's obvious where I'm going here. I don't see how this is any different from just saying the word "Object." Don't get me wrong, I'm not trying to come off too sarcastic here. I'm actually quite interested in challenging the OO norm that is obviously too easily accepted right now.