The Collaborative International Dictionary of English v.0.48:

Appertain \Ap`per*tain"\, v. i. [imp. & p. p. Appertained; p.
   pr. & vb. n. Appertaining.] [OE. apperteinen, apertenen,
   OF. apartenir, F. appartenir, fr. L. appertinere; ad +
   pertinere to reach to, belong. See Pertain.]
   To belong or pertain, whether by right, nature, appointment,
   or custom; to relate.
   [1913 Webster]

         Things appertaining to this life.        --Hooker.
   [1913 Webster]

         Give it unto him to whom it appertaineth. --Lev. vi. 5.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

36 Moby Thesaurus words for "appertaining":
   a propos, ad rem, admissible, affinitive, applicable, applying,
   apposite, appropriate, apropos, associative, belonging, comparable,
   comparative, congenial, connective, correlative, en rapport,
   germane, in point, involving, linking, material, pertaining,
   pertinent, proportionable, proportional, proportionate, referable,
   referring, relating, relational, relative, relevant, sympathetic,
   to the point, to the purpose