The Collaborative International Dictionary of English v.0.48:

Peonage \Pe"on*age\, n.
   The condition of a peon.
   [1913 Webster]

WordNet (r) 3.0 (2006):

peonage
    n 1: the condition of a peon
    2: the practice of making a debtor work for his creditor until
       the debt is discharged

Moby Thesaurus II by Grady Ward, 1.0:

47 Moby Thesaurus words for "peonage":
   abjectness, absolutism, attendance, baseness, bond service,
   bondage, captivity, control, debt slavery, deprivation of freedom,
   disenfranchisement, disfranchisement, domination, employ,
   employment, enslavement, enthrallment, feudalism, feudality,
   helotism, helotry, indentureship, meanness, menialness,
   ministration, ministry, restraint, serfdom, serfhood, servility,
   servitium, servitorship, servitude, slavery, slavishness,
   subjection, subjugation, submissiveness, subservience,
   subserviency, tendance, thrall, thralldom, tyranny, vassalage,
   villenage, yoke