The Collaborative International Dictionary of English v.0.48:

Seizure \Sei"zure\, n.
   1. The act of seizing, or the state of being seized; sudden
      and violent grasp or gripe; a taking into possession; as,
      the seizure of a thief, a property, a throne, etc.
      [1913 Webster]

   2. Retention within one's grasp or power; hold; possession;
      ownership.
      [1913 Webster]

            Make o'er thy honor by a deed of trust,
            And give me seizure of the mighty wealth. --Dryden.
      [1913 Webster]

   3. That which is seized, or taken possession of; a thing laid
      hold of, or possessed.
      [1913 Webster] Sejant

WordNet (r) 3.0 (2006):

seizure
    n 1: a sudden occurrence (or recurrence) of a disease; "he
         suffered an epileptic seizure" [syn: seizure, ictus,
         raptus]
    2: the act of forcibly dispossessing an owner of property [syn:
       capture, gaining control, seizure]
    3: the act of taking of a person by force [syn: capture,
       seizure]
    4: the taking possession of something by legal process

Moby Thesaurus II by Grady Ward, 1.0:

290 Moby Thesaurus words for "seizure":
   Jacksonian epilepsy, Rolandic epilepsy, abdominal epilepsy,
   abduction, abscess, access, accession, acquired epilepsy,
   activated epilepsy, acute pain, adoption, affect epilepsy, ague,
   akinetic epilepsy, amok, anemia, ankylosis, annexation, anointing,
   anointment, anoxia, apnea, apoplexy, appointment, apprehension,
   appropriation, arrest, arrestation, arrestment, arrogation,
   asphyxiation, assignment, assumption, asthma, ataxia, atrophy,
   attack, authorization, autonomic epilepsy, backache, bag, bear hug,
   bite, blaze, bleeding, blennorhea, blockage, booty, boring pain,
   breakdown, burst, bust, cachexia, cachexy, capture,
   cardiac epilepsy, catch, catching, charley horse, chill, chills,
   clench, clinch, cling, clinging, clonic spasm, clonus, clutch,
   colic, collaring, commandeering, confiscation, consecration,
   constipation, convulsion, coronation, cortical epilepsy, coughing,
   coup, cramp, cramps, crick, cursive epilepsy, cyanosis, cyclone,
   darting pain, death grip, delegation, deputation, diarrhea,
   diurnal epilepsy, dizziness, dragnet, dropsy, dysentery, dyspepsia,
   dyspnea, eclampsia, edema, election, emaciation, embrace,
   empowerment, encroachment, epilepsia, epilepsia gravior,
   epilepsia major, epilepsia minor, epilepsia mitior,
   epilepsia nutans, epilepsia tarda, epilepsy, epitasis, eruption,
   explosion, fainting, falling sickness, fatigue, fever,
   fibrillation, firm hold, fit, flare-up, flux, focal epilepsy,
   foothold, footing, forcible seizure, frenzy, fulgurant pain, furor,
   fury, gale, girdle pain, gnawing, grab, grabbing, grand mal,
   grapple, grasp, grip, gripe, griping, growth, gust, haul,
   haute mal, hemorrhage, high blood pressure, hitch, hold, hug,
   hurricane, hydrops, hypertension, hypotension, hysterical epilepsy,
   icterus, ictus, impounding, indigestion, inflammation,
   infringement, insomnia, invasion, iron grip, irruption, itching,
   jaundice, jumping pain, kidnapping, kink, labored breathing,
   lancinating pain, larval epilepsy, laryngeal epilepsy,
   laryngospasm, latent epilepsy, legitimate succession, lockjaw,
   low blood pressure, lumbago, marasmus, matutinal epilepsy,
   menstrual epilepsy, murderous insanity, musicogenic epilepsy,
   myoclonous epilepsy, nabbing, nasal discharge, nausea, necrosis,
   netting, nip, nocturnal epilepsy, occlusion, orgasm, outbreak,
   outburst, pain, pang, paralysis, paroxysm, petit mal,
   physiologic epilepsy, picking up, pinch, playing God, possession,
   power grab, prehension, prick, pruritus, psychic epilepsy,
   psychokinesia, psychomotor epilepsy, purchase, rage, rash,
   reflex epilepsy, rheum, rotatoria, running in, sclerosis, seizing,
   seizure of power, sensory epilepsy, sequestration, serial epilepsy,
   sexual climax, sharp pain, shock, shoot, shooting, shooting pain,
   skin eruption, snatch, snatching, sneezing, sore, spasm, spell,
   stab, stabbing pain, stitch, stoppage, storm, stroke, succession,
   tabes, tachycardia, take, taking, taking in, taking into custody,
   taking over, tardy epilepsy, tempest, tetanus, tetany, thrill,
   throes, thromboembolism, thrombosis, tight grip, toehold,
   tonic epilepsy, tonic spasm, tormen, tornado, torsion spasm,
   traumatic epilepsy, trespass, trespassing, trismus, tumor, turn,
   tweak, twinge, twitch, ucinate epilepsy, upheaval, upset stomach,
   usurpation, vertigo, visitation, vomiting, wasting, whirlwind,
   wrench



Bouvier's Law Dictionary, Revised 6th Ed (1856):

SEIZURE, practice. The act of taking possession of the property of a person
condemned by the judgment of a competent tribunal, to pay a certain sum of
money, by a sheriff, constable, or other officer, lawfully authorized
thereto, by virtue of an execution, for the purpose of having such property
sold according to law to satisfy the judgment. By seizure is also meant the
taking possession of goods for a violation of a public law; as the taking
possession of a ship for attempting an illicit trade. 2 Cranch, 18 7; 6
Cowen, 404; 4 Wheat. 100; 1 Gallis. 75; 2 Wash. C. C. 127, 567.
     2. The seizure is complete as soon as the goods are within the power of
the officer. 3 Rawle's Rep. 401; 16 Johns. Rep. 287; 2 Nott & McCord, 392; 2
Rawle's Rep. 142; Wats. on Sher. 172; Com. Dig. Execution, C 5.
     3. The taking of part of the goods in a house, however, by virtue of a
fieri facias in the name of the whole, is a good seizure of all. 8 East, R.
474. As the seizure must be made by virtue of an execution, it is evident
that it cannot be made after the return day. 2 Caine's Rep. 243; 4 John. R.
450. Vide Door; House; Search Warrant.