Actually, I do mean "equivocate". To quote Wikipedia, it is "the misleading use of a term with more than one meaning or sense (by glossing over which meaning is intended at a particular time)".

I know what "equivocate" means -- but when you equivocate by conflating one sense of a word with another sense of the word, its not described as equivocating the first sense with the latter sense. You might equivocate with a person (the person to whom you address the equivocation), or equivocate by interchanging one definition with another.