1. By virtue of an office or position
   "the head of the department serves as an ex officio member of the board"

1. By virtue of position
   "the president sat on the committee ex officio"
   - by right of office

See also: official

Encyclopedia: Ex officio

• double star
• double stitch
• double stopping
• double take
• double talk
• double time
• double tongue
• double up
• double vision
• double-barreled
• double-barrelled
• double-bedded
• double-bitted ax
• double-bitted axe
• double-blind experiment
• double-blind procedure
• double-blind study
• double-bogey
• double-breasted
• double-breasted jacket
• double-breasted suit
• double-check
• double-chinned
• double-click
• double-crosser