The Collaborative International Dictionary of English v.0.48:

Kith \Kith\ (k[i^]th), n. [OE. kith, cu[eth], AS.
   c[=y][eth][eth]e, c[=y][eth], native land, fr. c[=u][eth]
   known. [root]45. See Uncouth, Can, and cf. Kythe.]
   Acquaintance; kindred.
   [1913 Webster]

         And my near kith for that will sore me shend. --W.
                                                  Browne.
   [1913 Webster]

         The sage of his kith and the hamlet.     --Longfellow.
   [1913 Webster]

   Kith and kin, kindred more or less remote.
      [1913 Webster]

WordNet (r) 3.0 (2006):

kith
    n 1: your friends and acquaintances; "all his kith and kin"