The Collaborative International Dictionary of English v.0.48:

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.
         [Webster 1913 Suppl.]

   2. One of a corps of pensioned soldiers, as in London,
      employed as doorkeepers, messengers, etc.
      [Webster 1913 Suppl.]

   3. a uniformed doorman. [British]
      [WordNet 1.5] Commissional

WordNet (r) 3.0 (2006):

commissionaire
    n 1: a uniformed doorman