[1] : The Collaborative International Dictionary of English v.0.48

octroi \oc`troi"\, n. f.
   1. a privilege granted by the sovereign authority, as the
      exclusive right of trade granted to a guild or society; a
      concession.
      1913 webster

   2. a tax levied in money or kind at the gate of a french city
      on articles brought within the walls.
      1913 webster written also octroy.
      1913 webster
see also:
octroy 

[2] : WordNet (r) 2.0

octroi
     n : a tax on various goods brought into a town

Octroi >> O Words
Octroi, definition of term: Octroi
octroi_pag1.html