The Collaborative International Dictionary of English v.0.48:

Detriment \Det"ri*ment\ (d[e^]t"r[i^]*ment), n. [L. detrimentum,
   fr. deterere, detritum, to rub or wear away; de + terere to
   rub: cf. F. d['e]triment. See Trite.]
   1. That which injures or causes damage; mischief; harm;
      diminution; loss; damage; -- used very generically; as,
      detriments to property, religion, morals, etc.
      [1913 Webster]

            I can repair
            That detriment, if such it be.        --Milton.
      [1913 Webster]

   2. A charge made to students and barristers for incidental
      repairs of the rooms they occupy. [Eng.]

   Syn: Injury; loss; damage; disadvantage; prejudice; hurt;
        mischief; harm.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Detriment \Det"ri*ment\, v. t.
   To do injury to; to hurt. [Archaic]
   [1913 Webster]

         Other might be determined thereby.       --Fuller.
   [1913 Webster]

WordNet (r) 3.0 (2006):

detriment
    n 1: a damage or loss [syn: detriment, hurt]

Moby Thesaurus II by Grady Ward, 1.0:

90 Moby Thesaurus words for "detriment":
   abomination, atrocity, bad, bane, bankruptcy, befoulment,
   bereavement, blight, breakage, breakdown, collapse, corruption,
   cost, crack-up, crippling, crying evil, damage, dead loss, debit,
   defilement, denial, denudation, deprivation, despoilment,
   despoliation, destruction, dilapidation, disability, disablement,
   disadvantage, dispossession, disrepair, divestment, drawback,
   encroachment, evil, expense, forfeit, forfeiture, grievance,
   handicap, harm, havoc, hobbling, hurt, hurting, ill, impairment,
   incapacitation, infection, infringement, injury, inroad, liability,
   loser, losing, losing streak, loss, loss of ground, maiming,
   mayhem, mischief, mutilation, outrage, perdition, poison,
   pollution, prejudice, privation, robbery, ruin, ruination,
   ruinousness, sabotage, sacrifice, scathe, sickening, spoiling,
   spoliation, step backward, stripping, taking away, the worst,
   total loss, toxin, venom, vexation, weakening, woe, wrong