The Collaborative International Dictionary of English v.0.48:

Removal \Re*mov"al\ (-al), n.
   The act of removing, or the state of being removed.
   [1913 Webster]

WordNet (r) 3.0 (2006):

removal
    n 1: the act of removing; "he had surgery for the removal of a
         malignancy" [syn: removal, remotion]
    2: dismissal from office

Moby Thesaurus II by Grady Ward, 1.0:

271 Moby Thesaurus words for "removal":
   Doppler effect, abandonment, ablation, abrasion, abstraction,
   alienation, amotion, amputation, anastomotic operation,
   assassination, avulsion, baring, bloodless operation,
   bloody murder, booting out, bumping-off, capital operation,
   cashiering, castaway, castoff, catharsis, cleaning out, cleansing,
   clearance, clearing, compensating operation, conge,
   corneal transplant, crescent operation, cutting out, decampment,
   deconsecration, deduction, deep six, defecation, defenestration,
   defrocking, deliverance, delocalization, denudation, departure,
   depletion, deportation, deposal, deposition, deprivation,
   deracination, desquamation, detachment, dethronement, detrusion,
   disarrangement, disarticulation, disassociation, disbarment,
   disbarring, discard, discarding, discharge, discharging cargo,
   disconnectedness, disconnection, discontinuity, discrownment,
   disemployment, disengagement, disentanglement, disenthronement,
   disjointing, disjunction, dislocation, dismissal, displacement,
   displacing, disposal, disposition, disunion, divestment, division,
   divorce, divorcement, drainage, draining, drawing, drawing out,
   dredging, drilling, drumming out, dumping, egress, ejection,
   ejectment, elective operation, elimination, emergency operation,
   emotional release, emptying, enucleation, eradication, erosion,
   escape, evacuation, evolvement, evulsion, excavation, excision,
   excommunication, excoriation, excretion, execution, exfoliation,
   exhausting, exhaustion, exhibitionism, exile, exit, exodus,
   expatriation, exploratory operation, exposure, expression,
   expulsion, exsection, extermination, extirpation, extraction,
   extrication, extrusion, fenestration operation, firing, flight,
   forced resignation, forced separation, forcible shift, foul play,
   freeing, furloughing, getaway, going, heart transplant, hegira,
   heterotopia, homicide, impeachment, incoherence, indecent exposure,
   intermission, interval operation, isolation, jettison, junking,
   kicking downstairs, kicking upstairs, kidney transplant, killing,
   laying bare, layoff, leaving, liquidation, luxation,
   major operation, manslaughter, massacre, mining, minor operation,
   move, movement, moving, murder, obtrusion, off-loading, operation,
   organ transplant, organ transplantation, ostracism, ouster,
   ousting, outlawing, outlawry, overthrow, overthrowal,
   palliative operation, parting, partition, passing, pensioning off,
   pink slip, pressing out, pulling, purgation, purge, purging,
   purification, quarrying, radical operation, red shift, refinement,
   refuse, reject, rejectamenta, rejection, release, relocation,
   remotion, removement, reprieve, resection, respite, retirement,
   retreat, riddance, ripping out, sacking, scrapping, section,
   segmentation, separation, separatism, severance, shift, shifting,
   slaughter, slaying, squeezing out, stripping, subdivision,
   subduction, sublation, subtraction, superannuation, surcease,
   surgical intervention, surgical operation, surgical technique,
   surplusing, suspension, taking away, the ax, the boot, the bounce,
   the gate, the knife, the sack, throwaway, throwing out, thuggee,
   thuggery, thuggism, ticket, transfer, transference, transferral,
   transplant, unchurching, uncovering, unfrocking, unhinging,
   unjointing, unloading, unrooting, unseating, uprooting, venting,
   voidance, voiding, walking papers, walkout, wasting, withdrawal,
   wresting out, zoning