I have encountered the word proffer a few times and most of these times I find the word to be completely interchangeable with offer.
When and why is this word used? Am I misunderstanding the word?
Google translate supports my interchangeability position, so I'm not native speaking.
Edit: The proposition that proffer is built as (pre-)offer (as in first), is not at all appealing to me as a non-first offer would be a counter-offer.