Source : Webster's Revised Unabridged Dictionary (1913)

Commissionaire \Com*mis`sion*aire"\, n. [F. commissionnaire. Cf.
   {Commissioner}.]
   1. One intrusted with a commission, now only a small
      commission, as an errand; esp., an attendant or
      subordinate employee in a public office, hotel, or the
      like.

   Note: The commissionaire familiar to European travelers
         performs miscellaneous services as a light porter,
         messenger, solicitor for hotels, etc.

   2. One of a corps of pensioned soldiers, as in London,
      employed as doorkeepers, messengers, etc.

Source : WordNet®

commissionaire
     n : a uniformed doorman