The Collaborative International Dictionary of English v.0.48:

Omit \O*mit"\, v. t. [imp. & p. p. Omitted; p. pr. & vb. n.
   Omitting.] [L. omittere, omissum; ob (see Ob- + mittere
   to cause to go, let go, send. See Mission.]
   1. To let go; to leave unmentioned; not to insert or name; to
      drop.
      [1913 Webster]

            These personal comparisons I omit.    --Bacon.
      [1913 Webster]

   2. To forbear or fail to perform or to make use of; to leave
      undone; to neglect; to pass over.
      [1913 Webster]

            Her father omitted nothing in her education that
            might make her the most accomplished woman of her
            age.                                  --Addison.
      [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

21 Moby Thesaurus words for "omitting":
   aside from, bar, barring, beside, besides, ex, except, except for,
   excepting, excluding, exclusive of, leaving out, let alone,
   outside of, precluding, save, save and except, saving, than,
   unless, without