I agree - this is how it is generally used, and usage determines the meaning of words. You cannot, in general, deduce the precise meaning of words from first pr

I agree - this is how it is generally used, and usage determines the meaning of words. You cannot, in general, deduce the precise meaning of words from first principles or the dictionary definitions of related words. 'Opinionated' is a related word which does not mean exactly what it might seem from 'opinion'. In academia, there is plenty of disagreement, mostly handled without being disagreeable.