The Collaborative International Dictionary of English v.0.48:

Textual \Tex"tu*al\, a. [OE. textuel, F. textuel.]
   1. Of, pertaining to, or contained in, the text; as, textual
      criticism; a textual reading. --Milton.
      [1913 Webster]

   2. Serving for, or depending on, texts. --Bp. Hall.
      [1913 Webster]

   3. Familiar with texts or authorities so as to cite them
      accurately. "I am not textuel." --Chaucer.
      [1913 Webster]

WordNet (r) 3.0 (2006):

textual
    adj 1: of or relating to or based on a text; "textual analysis"

Moby Thesaurus II by Grady Ward, 1.0:

42 Moby Thesaurus words for "textual":
   Biblical, Christian, Gospel, Mosaic, New-Testament, Old-Testament,
   accepted, apocalyptic, apostolic, approved, authentic,
   authoritative, canonical, conventional, correct, customary,
   evangelic, evangelical, evangelistic, faithful, firm, gospel,
   inspired, literal, of the faith, orthodox, orthodoxical, proper,
   prophetic, received, revealed, revelational, right, scriptural,
   sound, standard, textuary, theopneustic, traditional,
   traditionalistic, true, true-blue