The Collaborative International Dictionary of English v.0.48:

Traditionalism \Tra*di"tion*al*ism\, n.
   A system of faith founded on tradition; esp., the doctrine
   that all religious faith is to be based solely upon what is
   delivered from competent authority, exclusive of rational
   processes.
   [1913 Webster]

WordNet (r) 3.0 (2006):

traditionalism
    n 1: strict adherence to traditional methods or teachings [syn:
         traditionalism, traditionality]
    2: adherence to tradition (especially in cultural or religious
       matters)
    3: the doctrine that all knowledge was originally derived by
       divine revelation and that it is transmitted by traditions

Moby Thesaurus II by Grady Ward, 1.0:

62 Moby Thesaurus words for "traditionalism":
   Mishnah, Spiritus Mundi, Sunna, Talmud, accommodation, accord,
   accordance, acquiescence, adaptation, adaption, adjustment,
   agreement, ancient wisdom, archetypal myth, archetypal pattern,
   authenticity, authoritativeness, canonicalness, canonicity,
   common law, compliance, conformance, conformation other-direction,
   conformity, congruity, consistency, conventionality,
   correspondence, custom, flexibility, folk motif, folklore,
   folktale, gospel truth, harmony, immemorial usage, keeping, legend,
   line, lore, malleability, myth, mythology, obedience, observance,
   orthodoxicalness, orthodoxism, orthodoxness, orthodoxy, pliancy,
   racial memory, reconcilement, reconciliation, religious truth,
   right belief, rightness, soundness, strictness, the truth,
   tradition, traditionality, uniformity