Source : Webster's Revised Unabridged Dictionary (1913)

Cost \Cost\ (k[o^]st; 115), v. t. [imp. & p. p. {Cost}; p. pr. &
   vb. n. {Costing}.] [OF. coster, couster, F. co[^u]ter, fr. L.
   constare to stand at, to cost; con- + stare to stand. See
   {Stand}, and cf. {Constant}.]
   1. To require to be given, expended, or laid out therefor, as
      in barter, purchase, acquisition, etc.; to cause the cost,
      expenditure, relinquishment, or loss of; as, the ticket
      cost a dollar; the effort cost his life.

            A diamond gone, cost me two thousand ducats. --Shak.

            Though it cost me ten nights' watchings. --Shak.

   2. To require to be borne or suffered; to cause.

            To do him wanton rites, which cost them woe.
                                                  --Milton.

   {To cost dear}, to require or occasion a large outlay of
      money, or much labor, self-denial, suffering, etc.

Source : WordNet®

costing
     n : cost accounting