straight

Definitions
Examples
Relations

(noun): Something that is not crooked or bent such as a part of a road or track.
(noun): Five cards in sequence.
(noun): A heterosexual.
(noun): A normal person; someone in mainstream society.
(noun): A cigarette, particularly one containing tobacco instead of marijuana. Also straighter.
(verb): To straighten.
(adjective): Not crooked or bent; having a constant direction throughout its length.
(adjective): (of a path, trajectory, etc.) Direct, undeviating.
(adjective): Perfectly horizontal or vertical; not diagonal or oblique.
(adjective): Describing the bat as held so as not to incline to either side; on, or near a line running between the two wickets.
(adjective): Direct in communication; unevasive, straightforward.
(adjective): Free from dishonesty; honest, law-abiding.
(adjective): Serious rather than comedic.
(adjective): In proper order; as it should be.
(adjective): In a row, in unbroken sequence; consecutive.
(adjective): Describing the sets in a match of which the winner did not lose a single set.
(adjective): Making no exceptions or deviations in one's support of the organization and candidates of a political party.
(adjective): Containing the names of all the regularly nominated candidates of a party and no others.
(adjective): Conventional, mainstream, socially acceptable.
(adjective): Heterosexual, attracted to people of the opposite sex.
(adjective): (of a romantic or sexual relation) Occurring between people of opposite sex.
(adjective): Not using alcohol, drugs, etc.
(adjective): Not plus size; thin.
(adjective): Strait; narrow.
(adjective): Stretched out; fully extended.
(adjective): Thorough; utter; unqualified.
(adjective): Of spirits: undiluted, unmixed; neat.
(adjective): Concerning the property allowing the parallel-transport of vectors along a course that keeps tangent vectors remain tangent vectors throughout that course (a course which is straight, a straight curve, is a geodesic).
(adverb): Of a direction relative to the subject, precisely; as if following a direct line.
(adverb): Directly; without pause, delay or detour.
(adverb): Continuously; without interruption or pause.

My friends call straights "heteros".
After four straight wins, Mudchester United are top of the league.
a straight Democrat
a straight ballot
straight marriage, sex, relationship

synonym

straightedge