The Collaborative International Dictionary of English v.0.48:

Breakage \Break"age\, n.
   1. The act of breaking; a break; a breaking; also, articles
      broken.
      [1913 Webster]

   2. An allowance or compensation for things broken
      accidentally, as in transportation or use.
      [1913 Webster]

WordNet (r) 3.0 (2006):

breakage
    n 1: the quantity broken; "the total breakage was huge"
    2: reimbursement for goods damaged while in transit or in use
    3: the act of breaking something; "the breakage was unavoidable"
       [syn: breakage, break, breaking]

Moby Thesaurus II by Grady Ward, 1.0:

86 Moby Thesaurus words for "breakage":
   abatement, agio, allowance, bank discount, bankruptcy, breach,
   break, breakdown, burst, cash discount, chain discount, charge-off,
   chip, cleft, collapse, concession, crack, crack-up, crippling, cut,
   damage, deduction, depreciation, destruction, detriment,
   dilapidation, disablement, discount, disrepair, drawback,
   encroachment, fissure, fracture, gap, harm, hobbling, hurt,
   hurting, impairment, incapacitation, infringement, injury, inroad,
   kickback, loss, maiming, mayhem, mischief, mutilation, penalty,
   penalty clause, percentage, premium, price reduction, price-cut,
   rebate, rebatement, reduction, refund, rent, rift, rip, rollback,
   ruination, ruinousness, rupture, sabotage, salvage, scale, scathe,
   setoff, sickening, slash, slice, slit, splinter, split, spoiling,
   tare, tear, time discount, trade discount, tret, underselling,
   weakening, write-off