Microsoft licensing has a vocabulary built by the seller, and most of the time the buyer learns it one expensive surprise at a time. These are the terms that appear in every agreement, quote, and compliance review, defined plainly and from the buyer's side of the table. Know the language before it is used to set your price.
This glossary explains the vocabulary. The engagement is where it becomes a negotiating position. Two analyst calls, no pitch, and an honest read on where your contract can actually move.