Source : Webster's Revised Unabridged Dictionary (1913)

   4. Conforming to justice and rectitude; not deviating from
      truth or fairness; upright; as, straight dealing.

   5. Unmixed; undiluted; as, to take liquor straight. [Slang]

   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.]

   {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.