[1] : The Collaborative International Dictionary of English v.0.48

warrant \war"rant\, n. oe. warant, of. warant a warrant, a
   defender, protector, f. garant, originally a p. pr. pf german
   origin, fr. ohg. wer=en to grant, warrant, g. gewaumhren;
   akin to ofries. wera. cf. guarantee.
   1913 webster
   1. that which warrants or authorizes; a commission giving
      authority, or justifying the doing of anything; an act,
      instrument, or obligation, by which one person authorizes
      another to do something which he has not otherwise a right
      to do; an act or instrument investing one with a right or
      authority, and thus securing him from loss or damage;
      commission; authority. specifically: 
      1913 webster
      a a writing which authorizes a person to receive money
          or other thing.
          1913 webster
      b law a precept issued by a magistrate authorizing an
          officer to make an arrest, a seizure, or a search, or
          do other acts incident to the administration of
          justice.
          1913 webster
      c mil.  nav. an official certificate of appointment
          issued to an officer of lower rank than a commissioned
          officer. see warrant officer, below.
          1913 webster

   2. that which vouches or insures for anything; guaranty;
      security.
      1913 webster

            i give thee warrant of thy place.     --shak.
      1913 webster

            his worth is warrant for his welcome hither. --shak.
      1913 webster

   3. that which attests or proves; a voucher.
      1913 webster

   4. right; legality; allowance. obs. --shak.
      1913 webster

   bench warrant. law see in the vocabulary.

   dock warrant com., a customhouse license or authority.

   general warrant. law see under general.

   land warrant. see under land.

   search warrant. law see under search, n.

   warrant of attorney law, written authority given by one
      person to another empowering him to transact business for
      him; specifically, written authority given by a client to
      his attorney to appear for him in court, and to suffer
      judgment to pass against him by confession in favor of
      some specified person. --bouvier.

   warrant officer, a noncommissioned officer, as a sergeant,
      corporal, bandmaster, etc., in the army, or a
      quartermaster, gunner, boatswain, etc., in the navy.

   warrant to sue and defend.
      a o. eng. law a special warrant from the crown,
          authorizing a party to appoint an attorney to sue or
          defend for him.
      b a special authority given by a party to his attorney
          to commence a suit, or to appear and defend a suit in
          his behalf. this warrant is now disused. --burrill.
          1913 webster
see also:
guarantee warrant officer bench warrant dock warrant general warrant general 
land warrant land search warrant search warrant of attorney 
warrant to sue and defend 

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

warrant of attorney, practice. an instrument in writing, addressed to one or 
more attorneys therein named, authorizing them generally to appear in any 
court, or in some specified court, on behalf of the person giving it, and to 
confess judgment in favor of some particular person therein named, in an 
action of debt, and usually containing a stipulation not to bring any writ 
of error, or file a bill in equity, so as to delay him. 
     2. this general authority is usually qualified by reciting a bond which 
commonly accompanies it, together with the condition annexed to it, or by a 
written defeasance stating the terms upon which it was given, and 
restraining the creditor from making immediate use of it. 31. in form it is 
generally by deed; but it seems, it need not necessarily be so. 5 taunt. 
264. 
     4. this instrument is given to the creditor as a security. possessing 
it, he may sign judgment and issue an execution, without its being necessary 
to wait the termination. of an action. vide 14 east, r. 576; 2 t. r. 100; 1 
h. bl. 75; 1 str 20; 2 bl. rep. 1133; 2 wils. 3; 1 chit. rep. 707. 
     5. a warrant of attorney given to confess a judgment is not revocable, 
and, notwithstanding a revocation, judgment may be entered upon it. 2 ld. 
raym. 766, 850; 1 salk. 87; 7 mod. 93; 2 esp, rep. 563. the death of the 
debtor is, however, generally speaking, a revocation. co. litt. 62 b; 1 
vent. 310. vide hall's pr. 14, n. 
     6. the virtue of a warrant of attorney is spent by the entry of one 
judgment, and a second judgment entered on the same warrant is irregular. 1 
penna. r. 245; 6 s.  r. 296: 14 s.  r. 170; addis. r. 267; 2 browne's r. 
321, 3 wash. c. c. r. 558. vide, generally, 18 eng. com. law rep. 94, 96, 
179, 209; 1 salk. 402; 3 vin. ab. 291; 1 sell. pr. 374; com. dig. abatement, 
e 1, 2; id. attorney, b 7, 8; 2 archbold's pr. 12; bing. on judgments, 38; 
grah. pr. 618; l crompt. pr. 316; 1 troub.  haly's pr. 96. 
     7. a warrant of attorney differs from a cognovit, actionem. q.v. see 
metc.  perk. dig. bond, iv. 

Attorney >> A Words
Attorney, definition of term: Attorney
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Warrant >> W Words
Warrant, definition of term: Warrant
warrant_pag1.html

Attorney Genera >> A Words
Attorney Genera, definition of term: Attorney Genera
attorney+genera_pag1.html

Stock Warrant >> S Words
Stock Warrant, definition of term: Stock Warrant
stock+warrant_pag1.html

Search Warrant >> S Words
Search Warrant, definition of term: Search Warrant
search+warrant_pag1.html

Bench Warrant >> B Words
Bench Warrant, definition of term: Bench Warrant
bench+warrant_pag1.html

States Attorney >> S Words
States Attorney, definition of term: States Attorney
states+attorney_pag1.html