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.

Source: Webster's Revised Unabridged Dictionary (1913)