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“Markov Decision Process (MDPs)” appears on the first page of the table of contents and is defined on the page indicated there.

The term is also used/linked in the fourth paragraph of the Wikipedia page for Reinforcement Learning.

It’s much more a table-stakes for talking about what problems the field tries to solve term than an exclusive preserve of the deeply immersed term.

It’s a bit like a primer on machine learning using the word “regression” casually a few times before actually defining it. Good editing practice? No. An actual road block to learning? Also no.