The Collaborative International Dictionary of English v.0.48:

Agrarian \A*gra"ri*an\, a. [L. agrarius, fr. ager field.]
   1. Pertaining to fields, or lands, or their tenure; esp.,
      relating to an equal or equitable division of lands; as,
      the agrarian laws of Rome, which distributed the conquered
      and other public lands among citizens.
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            His Grace's landed possessions are irresistibly
            inviting to an agrarian experiment.   --Burke.
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   2. (Bot.) Wild; -- said of plants growing in the fields.
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The Collaborative International Dictionary of English v.0.48:

Agrarian \A*gra"ri*an\, n.
   1. One in favor of an equal division of landed property.
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   2. An agrarian law. [R.]
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            An equal agrarian is perpetual law.   --Harrington.
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WordNet (r) 3.0 (2006):

agrarian
    adj 1: relating to rural matters; "an agrarian (or agricultural)
           society"; "farming communities" [syn: agrarian,
           agricultural, farming(a)]

Moby Thesaurus II by Grady Ward, 1.0:

20 Moby Thesaurus words for "agrarian":
   Arcadian, agrestic, agricultural, agronomic, arable, bucolic,
   country, farm, farming, geoponic, lowland, native, natural,
   pastoral, provincial, rural, rustic, uncultivated, undomesticated,
   upland