Source : Webster's Revised Unabridged Dictionary (1913)

Coigne \Coigne\ (koin), n. [See {Coin}, n.]
   A quoin.

         See you yound coigne of the Capitol? yon corner stone?
                                                  --Shak.

Coigne \Coigne\, Coigny \Coign"y\, n.
   The practice of quartering one's self as landlord on a
   tenant; a quartering of one's self on anybody. [Ireland]
   --Spenser.

Source : WordNet®

coigne
     n 1: expandable metal or wooden wedge used by printers to lock up
          a form within a chase [syn: {quoin}, {coign}]
     2: the keystone of an arch [syn: {quoin}, {coign}]