intransitive verb.
To perform the duties and functions of an office or a position of authority.
intransitive verb.
To serve as an officiant.
intransitive verb.
To serve as a referee or umpire.
intransitive verb.
To perform from a position of authority (an official duty or function).
intransitive verb.
To serve as an officiant at (a ceremony).
intransitive verb.
To serve as a referee or umpire at (a game).
The Century Dictionary and Cyclopedia
To perform official duties; perform such formal acts, duties, or ceremonies as pertain to an office or post; serve.
To perform or take part in.
To supply; give out.
the GNU version of the Collaborative International Dictionary of English
transitive verb.
To discharge, perform, or supply, as an official duty or function.
intransitive verb.
To act as an officer in performing a duty; to transact the business of an office or public trust; to conduct a public ceremony or service.