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Not crooked, curly, or bent; having a constant direction throughout its length.
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(of a path, trajectory, etc.) Direct, undeviating.
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Perfectly horizontal or vertical; not diagonal or oblique.
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(cricket) Describing the bat as held so as not to incline to either side; on, or near a line running between the two wickets.
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(engineering, of an internal-combustion engine) Having all cylinders in a single straight line; in-line.
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Direct in communication; unevasive, straightforward.
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Free from dishonesty; honest, law-abiding.
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Serious rather than comedic.
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In proper order; as it should be.
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In a row, in unbroken sequence; consecutive.
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(tennis) Describing the sets in a match of which the winner did not lose a single set.
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(US, politics) Making no exceptions or deviations in one's support of the organization and candidates of a political party.
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(US, politics) Containing the names of all the regularly nominated candidates of a single party and no others.
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(colloquial) Conventional; mainstream; socially acceptable.
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(colloquial) Heterosexual.
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(colloquial, of a romantic or sexual relation) Occurring between people of opposite sex (sometimes, but not always, specifically between heterosexual people).
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(slang, sex work) Related to conventional sexual intercourse.
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(colloquial) Not using alcohol, drugs, etc.
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(fashion) Not plus size; thin.
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(rare, now chiefly religion) Strait; narrow.
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(obsolete) Stretched out; fully extended.
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(slang) Thorough; utter; unqualified.
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Of spirits: undiluted, unmixed; neat.
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(telegraphy, historical, of a telegram) Sent at a full rate for immediate delivery; being a fast telegram.
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(sciences, mathematics) Concerning the property allowing the parallel transport of vectors along a course that keeps tangent vectors remain as such throughout that course (a course which is straight, a straight curve, is a geodesic).
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(informal, of a person) OK, all right, fine; in a good state or situation.
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(informal, of people, reciprocal) On good terms.