COCKERMOUTH, a borough-town of Cumberland, situated on the river Derwent, near the Irish sea, about twenty-five miles south-west of Carlisle: W. lon. 3° 10', and N. lat. 54° 35'. It sends two members to parliament.

COCKET is a seal belonging to the king's custom-house, or rather a scroll of parchment sealed and delivered by the officers of the customs to merchants, as a warrant that their merchandises are customed.

It is also used for the office where goods transported were first entered, and paid their custom, and had a cocket or certificate of discharge.