assuefaction

from The Collaborative International Dictionary of English v.0.48

Assuefaction \As`sue*fac"tion\, n. [L. assuefacere to accustom
   to; assuetus (p. p. of assuescere to accustom to) + facere to
   make; cf. OF. assuefaction.]
   The act of accustoming, or the state of being accustomed;
   habituation. [Obs.]
   [1913 Webster]

         Custom and studies efform the soul like wax, and by
         assuefaction introduce a nature.         --Jer. Taylor.
   [1913 Webster]