Glossary
What is a designated pilot examiner?
A private individual the FAA authorizes to give practical tests and issue certificates on its behalf. A DPE is not an FAA employee and charges a fee for the test, normally separate from anything the flight school bills.
Also called DPE, examiner
That is the whole entry for now. The longer version, with the mechanics and worked examples, is still to be written. See autorotation for how those read once they exist.