Meaning of terms

Taking formal languages (fl) as an analogue, we can think of the ways by which terms are introduced to a lexicon. In a fl one uses basic undefined terms to define subsequent lexicon. Of course, basic terms appear in sentences and thus can be contextually defined after developing a theory, i. e., a set of sentences held as true. The word set is undefined in most set theories but that doesn't mean it's meaningless; quite the opposite, the meaning of set is set by all the axioms. Now, a lot of philosophers talk about the "meaning of a term" in ordinary languages and more often than not they refer to the definition of a term as if ordinary languages had formal semantics that aloud them to introduce terms that way. (My guess here is that the all mighty dictionary provides all the fiction required to believe in ordinary language definitions. Of course, the dictionary reports meaning, it does not introduces the terms nor "provides" meaning to them.) In a way, all terms are introduced to a lexicon as basic undefined terms in ordinary languages: they appear in a number of sentences held true. The meaning thus of an ordinary word, for instance, is the set of all sentences that are (ordinarily) taken as true. (The fact that such sentences can be arranged as equations doesn't alter the fact that they were never introduce as definitions for one is a temporal process, the other a grammato-logical operation). Of course, when we talk of the meaning of a term we think of those sentences that are the most likely to be held true by any speaker, and so on.
   This is again to think about Butler, for she often mentions "the definition of women" or similar expressions. There is no definition of the ordinary term "women" and this is important for her discussions since a word that is used derogatorily by a particular set of speakers can be used in different ways by another, and so on. One could say, of course, that those sets don't stand in equal footing at the moment of deciding what is the "real meaning" of the word; but then again that's a way to beg the question, for influential sets of speakers can't eliminate all other uses of a word.