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]

Moby Thesaurus II by Grady Ward, 1.0:

490 Moby Thesaurus words for "straight":
   OK, aboveboard, absolute, absolutely, accordant, accurate,
   accurately, ace, admitting no exception, agreed, air line,
   all right, all-embracing, all-encompassing, all-out, all-pervading,
   amorous, anal, angelic, arranged, arrowlike, articulated, artless,
   at once, authentic, away, axis, bare, beeline, best bower, bluff,
   blunt, bona fide, born, bourgeois, bower, broad, broad-based,
   brusque, button-down, candid, candidly, cards, carnal, categorical,
   catenated, ceaseless, chord, clarified, clean, clear, clubs,
   complete, composed, comprehensive, compulsive, concatenated,
   concentrated, conclusive, concordant, conformist, congenital,
   connected, constant, consummate, continual, continued, continuing,
   continuous, conventional, correct, correctly, corresponding,
   cyclical, dead, dead ahead, dead right, dead straight, decent,
   decided, decisive, deck, deep-dyed, definite, definitely,
   definitive, dependable, determinate, deuce, diagonal, diameter,
   diamonds, direct, direct line, directly, directrix, distilled,
   down the alley, downright, due, due north, dummy, dyed-in-the-wool,
   edge, egregious, emotionless, endless, entire, equitable, erect,
   erogenic, erogenous, erotic, erotogenic, even, exactly, exhaustive,
   explicit, explicitly, express, expressly, face cards, fair,
   fair and square, faithfully, faithworthy, faultless, faultlessly,
   featureless, final, fixed, flat, flat-out, flawless, flawlessly,
   fleshly, flush, formalistic, forthright, forthwith, foursquare,
   frank, frankhearted, free, free-speaking, free-spoken,
   free-tongued, full, full house, gamic, gapless, genuine, global,
   godly, good, good-faith, great-circle course, hand, harmonious,
   heart-to-heart, hearts, heterosexual, honest, honestly, honorable,
   horizontal, immediate, immediately, impassive, implicit,
   in a beeline, in a line, in accord, in all respects,
   in every respect, in keeping, in line, in line with, in order,
   in step, inappealable, incessant, incorruptible, indisputable,
   ingenuous, instanter, instantly, intensive, interminable,
   inviolable, ipsissimis verbis, irreversible, jack, joined,
   jointless, joker, just, just right, just so, kerplunk, king, knave,
   kosher, left bower, legitimate, letter-perfect, level, libidinal,
   lineal, linear, linked, literally, literatim, meticulous,
   monotonous, moral, naked, neat, never-ending, no-nonsense, nonstop,
   normal, now, nuptial, okay, omnibus, omnipresent, on the beam,
   on the level, on the square, on the straight, on the up-and-up,
   one-way, open, open and aboveboard, openhearted, orderly,
   organized, orthodox, out-and-out, outright, outspoken, oversexed,
   pack, pair, pedantic, peremptory, perennial, perfect, perfectly,
   periodic, perpendicular, pervasive, picture cards, plain,
   plain dealing, plain-spoken, plainly, plastic, playing cards, plop,
   plumb, plump, plunk, point-blank, positive, positively, potent,
   precisely, precisianistic, procreative, promptly, proper, properly,
   proven, pure, purified, queen, radical, radius, radius vector,
   rectified, rectilineal, rectilinear, recurrent, regular, reliable,
   repetitive, respectable, responsible, right, right away,
   right line, right off, right-minded, righteous, rightly, rigidly,
   rigorously, round, round-the-clock, royal flush, rubber, ruff,
   ruler-straight, running, saintlike, saintly, seamless, secant,
   sedate, segment, sensual, seraphic, serious, serried, settled, sex,
   sexed, sexlike, sexual, sexy, sheer, shipshape, shortcut, sic,
   side, simple, simply, sincere, single-hearted, singleton, smack,
   smack-dab, smooth, so, sober, spades, spang, spruce, square,
   square-dealing, square-shooting, squarely, stable, staid, steady,
   straight across, straight ahead, straight course, straight line,
   straight stretch, straight up, straight-cut, straight-front,
   straight-out, straight-shooting, straight-side,
   straight-up-and-down, straightaway, straightforward,
   straightforwardly, straightforwards, straightly, straightway,
   streamline, streamlined, strictly, strong, stuffy, summarily, sure,
   sweeping, taciturn, tangent, tested, thorough, thoroughgoing,
   through, through-and-through, tidy, to be trusted, to the letter,
   total, traditionalist, transparent, transversal, trey, trick,
   tried, tried and true, true, trump, trustable, trustworthy, trusty,
   twenty-four-hour, ubiquitous, unadulterated, unalloyed, unaltered,
   unambiguous, unambiguously, unbending, unbent, unblended, unbowed,
   unbroken, unceasing, unchecked, uncircumscribed, uncombined,
   uncompounded, unconditional, unconstrained, uncorrupted, uncurved,
   uncut, undeflected, undersexed, undeviating, undeviatingly,
   undifferentiated, undiluted, undistorted, undoubting,
   unembellished, unemotional, unending, unequivocal, unequivocally,
   unerringly, unfalse, unfortified, unguarded, unhampered,
   unhesitating, unidirectional, uniform, unintermitted,
   unintermittent, unintermitting, uninterrupted, universal,
   unleavened, unlimited, unmingled, unmistakable, unmitigated,
   unmixed, unmodified, unperfidious, unqualified, unquestioning,
   unrelieved, unremitting, unreserved, unrestrained, unrestricted,
   unsmiling, unsophisticated, unstopped, unswerving, unswervingly,
   untinged, untreacherous, unturned, unveeringly, unwaivable,
   up-and-up, upright, upstanding, uptight, utter, vector, venereal,
   verbally, verbatim, verbatim et litteratim, veritable, vertical,
   virtuous, voluptuous, whole, wholesale, without delay,
   without exception, without reserve, word by word, word for word