oblique

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Having a slanting or sloping direction, course, or position; inclined.
• adjective Mathematics Designating geometric lines or planes that are neither parallel nor perpendicular.
• adjective Botany Having the part on one side of the midrib of a different size or shape than the part on the other side. Used of a leaf.
• adjective Anatomy Situated in a slanting position; not transverse or longitudinal.
• adjective Indirect or evasive.
• adjective Devious, misleading, or dishonest.
• adjective Not direct in descent; collateral.
• adjective Grammar Designating any noun case except the nominative or the vocative.
• noun An oblique thing, such as a line, direction, or muscle.
• noun Nautical The act of changing course by less than 90°.
• adverb At an angle of 45°.

from The Century Dictionary.

• Of lines or planes, making with a given line, surface, or direction an angle that is less than 90°; neither perpendicular nor parallel; of angles, either acute or obtuse, not right; in general, not direct; aslant; slanting. See cuts under angle.
• Indirect, in a figurative sense: as, an oblique reproach or taunt.
• Questionable from a moral point of view; not upright or morally direct; evil.
• In botany, unequal-sided.
• noun In anatomy, an oblique muscle: as, the external oblique of the abdomen. See obliquus.
• To deviate from a direct line or from the perpendicular; slant; slope.
• To advance slantingly or obliquely; specifically (military), to advance obliquely by making a half-face to the right or left and marching in the new direction.
• noun In geometry, except the perpendicular, any sect from a point to a straight or a plane.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Geom.) An oblique line.
• intransitive verb To deviate from a perpendicular line; to move in an oblique direction.
• intransitive verb (Mil.) To march in a direction oblique to the line of the column or platoon; -- formerly accomplished by oblique steps, now by direct steps, the men half-facing either to the right or left.
• adjective Not erect or perpendicular; neither parallel to, nor at right angles from, the base; slanting; inclined.
• adjective Not straightforward; indirect; obscure
• adjective Not direct in descent; not following the line of father and son; collateral.
• adjective See under Angle, Ascension, etc.
• adjective (Arch.) an arch whose jambs are not at right angles with the face, and whose intrados is in consequence askew.
• adjective a skew bridge. See under Bridge, n.
• adjective (Gram.) any case except the nominative. See Case, n.
• adjective (Projection) a circle whose plane is oblique to the axis of the primitive plane.
• adjective (Mil.) a fire the direction of which is not perpendicular to the line fired at.
• adjective (Fort.) that part of the curtain whence the fire of the opposite bastion may be discovered.
• adjective (Bot.) A leaf having one half different from the other.
• adjective (Geom.) a line that, meeting or tending to meet another, makes oblique angles with it.
• adjective (Mus.) a kind of motion or progression in which one part ascends or descends, while the other prolongs or repeats the same tone, as in the accompanying example.
• adjective (Anat.) a muscle acting in a direction oblique to the mesial plane of the body, or to the associated muscles; -- applied especially to two muscles of the eyeball.
• adjective See Oblique speech.
• adjective (Dialing) planes which decline from the zenith, or incline toward the horizon.
• adjective (Naut.) the movement of a ship when she sails upon some rhumb between the four cardinal points, making an oblique angle with the meridian.
• adjective (Rhet.) speech which is quoted indirectly, or in a different person from that employed by the original speaker.
• adjective (Astron. & Geog.) the celestial or terrestrial sphere when its axis is oblique to the horizon of the place; or as it appears to an observer at any point on the earth except the poles and the equator.
• adjective (Mil.) a step in marching, by which the soldier, while advancing, gradually takes ground to the right or left at an angle of about 25°. It is not now practiced.
• adjective (Anal. Geom.) a system in which the coördinate axes are oblique to each other.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Not erect or perpendicular; neither parallel to, nor at right angles from, the base; slanting; inclined.
• adjective Not straightforward; indirect; obscure; hence, disingenuous; underhand; perverse; sinister.
• adjective Not direct in descent; not following the line of father and son; collateral.
• adjective botany, of leaves Having the base of the blade asymmetrical, with one side larger or extending further than the other.