Definition of cornetcy in US English:

cornetcy

noun

historical
  • The position or rank of a cornet (rank of commissioned officer) in a cavalry troop.

    ‘he was appointed to a cornetcy in the 6th dragoon guards’

Origin

Mid 18th century: from cornet + -cy.

Pronunciation

cornetcy

/ˌkôrˈnetsē//ˌkɔrˈnɛtsi/