Definition of "in ordinary"

in ordinary

prepositional phrase
1. In an official capacity (chiefly as a post-modifier in official titles).
  Quotations
  The king experienced his first attack in autumn 1788, and as his condition worsened and the physicians-in-ordinary proved unable to cope or cure, the Reverend Dr Francis Willis (1717–1807), a clergyman doctor who ran a madhouse in Lincolnshire, was called in.
  1997, Roy Porter, The Greatest Benefit to Mankind, Folio Society, published 2016, page 263
2. (nautical) Out of commission and laid up; said of a naval vessel.