The Collaborative International Dictionary of English v.0.48:

Straight \Straight\, a. [Compar. Straighter; superl.
   Straightest.] [OE. strei?t, properly p. p. of strecchen to
   stretch, AS. streht, p. p. of streccan to stretch, to extend.
   See Stretch.]
   1. Right, in a mathematical sense; passing from one point to
      another by the nearest course; direct; not deviating or
      crooked; as, a straight line or course; a straight piece
      of timber.
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            And the crooked shall be made straight. --Isa. xl.
                                                  4.
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            There are many several sorts of crooked lines, but
            there is only one which is straight.  --Dryden.
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   2. (Bot.) Approximately straight; not much curved; as,
      straight ribs are such as pass from the base of a leaf to
      the apex, with a small curve.
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   3. (Card Playing) Composed of cards which constitute a
      regular sequence, as the ace, king, queen, jack, and
      ten-spot; as, a straight hand; a straight flush.
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   4. Conforming to justice and rectitude; not deviating from
      truth or fairness; upright; as, straight dealing.
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   5. Unmixed; undiluted; as, to take liquor straight. [Slang]
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   6. Making no exceptions or deviations in one's support of the
      organization and candidates of a political party; as, a
      straight Republican; a straight Democrat; also, containing
      the names of all the regularly nominated candidates of a
      party and no others; as, a straight ballot. [Political
      Cant, U.S.]
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   Straight arch (Arch.), a form of arch in which the intrados
      is straight, but with its joints drawn radially, as in a
      common arch.

   A straight face, one giving no evidence of merriment or
      other emotion.

   A straight line. "That which lies evenly between its
      extreme points." --Euclid. "The shortest line between two
      points." --Chauvenet. "A line which has the same direction
      through its whole length." --Newcomb.

   Straight-way valve, a valve which, when opened widely,
      affords a straight passageway, as for water.
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The Collaborative International Dictionary of English v.0.48:

Straight \Straight\, a.
   A variant of Strait, a. [Obs. or R.]
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         Egypt is a long country, but it is straight, that is to
         say, narrow.                             --Sir J.
                                                  Mandeville.
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The Collaborative International Dictionary of English v.0.48:

Straight \Straight\, adv.
   In a straight manner; directly; rightly; forthwith;
   immediately; as, the arrow went straight to the mark.
   "Floating straight." --Shak.
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         I know thy generous temper well;
         Fling but the appearance of dishonor on it,
         It straight takes fire, and mounts into a blaze.
                                                  --Addison.
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         Everything was going on straight.        --W. Black.
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The Collaborative International Dictionary of English v.0.48:

Straight \Straight\, n. (Poker)
   A hand of five cards in consecutive order as to value; a
   sequence. When they are of one suit, it is calles straight
   flush.
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The Collaborative International Dictionary of English v.0.48:

Straight \Straight\, v. t.
   To straighten. [R.] --A Smith.
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WordNet (r) 3.0 (2006):

straight
    adv 1: without deviation; "the path leads directly to the lake";
           "went direct to the office" [syn: directly, straight,
           direct]
    2: in a forthright manner; candidly or frankly; "he didn't
       answer directly"; "told me straight out"; "came out flat for
       less work and more pay" [syn: directly, flat, straight]
       [ant: indirectly]
    3: in a straight line; in a direct course; "the road runs
       straight"
    adj 1: successive (without a break); "sick for five straight
           days" [syn: straight, consecutive]
    2: having no deviations; "straight lines"; "straight roads
       across the desert"; "straight teeth"; "straight shoulders"
       [ant: crooked]
    3: (of hair) having no waves or curls; "her naturally straight
       hair hung long and silky" [ant: curly]
    4: erect in posture; "sit straight"; "stood defiantly with
       unbowed back" [syn: straight, unbent, unbowed]
    5: in keeping with the facts; "set the record straight"; "made
       sure the facts were straight in the report"
    6: characterized by honesty and fairness; "straight dealing"; "a
       square deal" [syn: straight, square] [ant: corrupt,
       crooked]
    7: no longer coiled [syn: uncoiled, straight] [ant:
       coiled]
    8: free from curves or angles; "a straight line" [ant: curved,
       curving]
    9: neatly arranged; not disorderly; "the room is straight now"
    10: not homosexual
    11: accurately fitted; level; "the window frame isn't quite
        true" [syn: true, straight]
    12: without evasion or compromise; "a square contradiction"; "he
        is not being as straightforward as it appears" [syn:
        square(a), straightforward, straight]
    13: without water; "took his whiskey neat" [syn: neat,
        straight, full-strength]
    14: following a correct or logical method; "straight reasoning"
    15: rigidly conventional or old-fashioned [syn: square,
        straight]
    n 1: a heterosexual person; someone having a sexual orientation
         to persons of the opposite sex [syn: heterosexual,
         heterosexual person, straight person, straight]
    2: a poker hand with 5 consecutive cards (regardless of suit)
    3: a straight segment of a roadway or racecourse [syn:
       straightaway, straight]