WordNet (r) 3.0 (2006):

dispense with
    v 1: give up what is not strictly needed; "he asked if they
         could spare one of their horses to speed his journey" [syn:
         spare, give up, part with, dispense with]
    2: do without or cease to hold or adhere to; "We are dispensing
       with formalities"; "relinquish the old ideas" [syn: waive,
       relinquish, forgo, forego, foreswear, dispense
       with]
    3: forgo or do or go without

Moby Thesaurus II by Grady Ward, 1.0:

60 Moby Thesaurus words for "dispense with":
   abandon, abjure, absolve, abstain, cede, discharge, disgorge,
   dispense from, dispose of, do without, drop, dump, except, excuse,
   exempt, forbear, forgo, forswear, free, get along without,
   get rid of, give away, give dispensation from, give up,
   grant immunity, have done with, hold back, hold off, keep back,
   keep in hand, kiss good-bye, let alone, let go, let off,
   make a sacrifice, not touch, not use, part with, quitclaim, recant,
   refrain, release, relinquish, remise, remit, render up, renounce,
   reserve, resign, retract, sacrifice, save, save the necessity,
   spare, surrender, swear off, throw up, vacate, waive, yield