IPA: /ˈkɜrnəl.si/
KK: /ˈkɜrnəlsi/
The position or rank held by a colonel in the military.
He was promoted to the colonelcy after many years of dedicated service.
Colonelcy is formed from "colonel" (from Middle French *coronel*, meaning the commander of a regiment) and the suffix "-cy" (meaning the state or condition of). The word refers to the rank or position of a colonel.
Think of a colonel as a commander ('colonel') and '-cy' indicating a state or condition, so 'colonelcy' means the state of being a colonel.