1.  forfeiture(n = noun.possession) forfeit - something that is lost or surrendered as a penalty;
is a kind of loss
Derived form verb forfeit₁

2.  forfeiture(n = noun.possession) forfeit - a penalty for a fault or mistake that involves losing or giving up something; "the contract specified forfeits if the work was not completed on time"
is a kind of penalty
Derived form verb forfeit₁

3.  forfeiture(n = noun.act) forfeit, sacrifice - the act of losing or surrendering something as a penalty for a mistake or fault or failure to perform etc.;
is a kind of act, deed, human action, human activity
Derived form verb forfeit₁

1.  The act of forfeiting; the loss of some right, privilege, estate, honor, office, or effects, by an offense, crime, breach of condition, or other act. [1913 Webster]
"Under pain of foreiture of the said goods." [1913 Webster]

2.  That which is forfeited; a penalty; a fine or mulct. [1913 Webster]
"What should I gain
By the exaction of the forfeiture?"

N  nonobservance, evasion, inobservance, failure, omission, neglect, laches, laxity, informality, infringement, infraction, violation, transgression, piracy, retraction, retractation, repudiation, nullification, protest, forfeiture, lawlessness, disobedience, bad faith, violating, lawless, transgressive, elusive, evasive, unfulfilled &c (fulfill).

N  loss, deperdition, perdition, forfeiture, lapse, privation, bereavement, deprivation, riddance, damage, squandering, waste, losing, not having, shorn of, deprived of, denuded, bereaved, bereft, minus, cut off, dispossessed, rid of, quit of, out of pocket, lost, long lost, irretrievable, off one's hands, Int, farewell to!, adieu to.

N  penalty, retribution, pain, pains and penalties, weregild, wergild, peine forte et dure, penance, the devil to pay, fine, mulct, amercement, forfeit, forfeiture, escheat, damages, deodand, sequestration, confiscation, premunire, doomage.

N  undueness, malum prohibitum, impropriety, illegality, falseness, emptiness of title, invalidity of title, illegitimacy, loss of right, disfranchisement, forfeiture, usurpation, tort, violation, breach, encroachment, presumption, assumption, seizure, stretch, exaction, imposition, lion's share, usurper, pretender, undue, unlawful, unconstitutional, illicit, unauthorized, unwarranted, disallowed, unallowed, unsanctioned, unjustified, unentitled, disentitled, unqualified, disqualified, unprivileged, unchartered, illegitimate, bastard, spurious, supposititious, false, usurped, tortious, undeserved, unmerited, unearned, unfulfilled, forfeited, disfranchised, improper, unmeet, unfit, unbefitting, unseemly, unbecoming, misbecoming, seemless, contra bonos mores, not the thing, out of the question, not to be thought of, preposterous, pretentious, would-be, filius nullius.