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one entrusted with a small commission, such as an errand (especially, an attendant or subordinate employee in a public office, hotel, etc.  wiktionary.org) | |||
| a uniformed doorman (When the day came Nick turned up early at the bank and waited under a palm tree in the atrium. People hurried in, nodding to the commissionaire, who still wore a tailcoat and a top hat. wiktionary.org) | |||
| an undisclosed agent under European civil law (wiktionary.org) | |||