The Collaborative International Dictionary of English v.0.48:

Ticket \Tick"et\, n. [F. ['e]tiquette a label, ticket, fr. OF.
   estiquette, or OF. etiquet, estiquet; both of Teutonic
   origin, and akin to E. stick. See Stick, n. & v., and cf.
   Etiquette, Tick credit.]
   A small piece of paper, cardboard, or the like, serving as a
   notice, certificate, or distinguishing token of something.
   Specifically:
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   (a) A little note or notice. [Obs. or Local]
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             He constantly read his lectures twice a week for
             above forty years, giving notice of the time to his
             auditors in a ticket on the school doors. --Fuller.
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   (b) A tradesman's bill or account. [Obs.]
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   Note: Hence the phrase on ticket, on account; whence, by
         abbreviation, came the phrase on tick. See 1st Tick.
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               Your courtier is mad to take up silks and velvets
               On ticket for his mistress.        --J. Cotgrave.
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   (c) A certificate or token of right of admission to a place
       of assembly, or of passage in a public conveyance; as, a
       theater ticket; a railroad or steamboat ticket.
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   (d) A label to show the character or price of goods.
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   (e) A certificate or token of a share in a lottery or other
       scheme for distributing money, goods, or the like.
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   (f) (Politics) A printed list of candidates to be voted for
       at an election; a set of nominations by one party for
       election; a ballot. [U. S.]
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             The old ticket forever! We have it by thirty-four
             votes.                               --Sarah
                                                  Franklin
                                                  (1766).
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   Scratched ticket, a ticket from which the names of one or
      more of the candidates are scratched out.

   Split ticket, a ticket representing different divisions of
      a party, or containing candidates selected from two or
      more parties.

   Straight ticket, a ticket containing the regular
      nominations of a party, without change.

   Ticket day (Com.), the day before the settling or pay day
      on the stock exchange, when the names of the actual
      purchasers are rendered in by one stockbroker to another.
      [Eng.] --Simmonds.

   Ticket of leave, a license or permit given to a convict, or
      prisoner of the crown, to go at large, and to labor for
      himself before the expiration of his sentence, subject to
      certain specific conditions. [Eng.] --Simmonds.

   Ticket porter, a licensed porter wearing a badge by which
      he may be identified. [Eng.]
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WordNet (r) 3.0 (2006):

straight ticket
    n 1: a ballot cast by a voter who votes for all the candidates
         of one party [ant: split ticket]