The Collaborative International Dictionary of English v.0.48:

Cocket \Cock"et\, a. [F. coquet coquettish. See Coquette, n.]
   Pert; saucy. [Obs.] --Halliwell.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Cocket \Cock"et\, n.
   1. (Eng. Law) A customhouse seal; a certified document given
      to a shipper as a warrant that his goods have been duly
      entered and have paid duty.
      [1913 Webster]

   2. An office in a customhouse where goods intended for export
      are entered. [Eng.]
      [1913 Webster]

   3. A measure for bread. [Obs.] --Blount.
      [1913 Webster]