The Collaborative International Dictionary of English v.0.48:

Errata \Er*ra"ta\, n. pl. [L.]
   1. Plural of erratum. See Erratum.
      [1913 Webster]

   2. A list of errors together with the corrections for the
      errors, added as a separate page of a text prior to
      publication, or as a separate sheet inserted into a
      printed text; as, the errata was added after the
      printing was finished..
      [PJC]

   Note: Although originally a plural word, the use of errata
         as a singular word in second sense has become common.
         [PJC]

The Collaborative International Dictionary of English v.0.48:

Erratum \Er*ra"tum\, n.; pl. Errata. [L., fr. errare, erratum,
   to wander, err. See Err.]
   An error or mistake in writing or printing.
   [1913 Webster]

         A single erratum may knock out the brains of a whole
         passage.                                 --Cowper.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

44 Moby Thesaurus words for "errata":
   acknowledgments, back, back matter, bastard title, bibliography,
   catch line, catchword, colophon, contents, contents page,
   copyright page, dedication, endleaf, endpaper, endsheet, flyleaf,
   folio, fore edge, foreword, front matter, half-title page, head,
   imprint, index, inscription, introduction, leaf, makeup, page,
   preface, preliminaries, recto, reverso, running title, signature,
   subtitle, table of contents, tail, text, title, title page,
   trim size, type page, verso