(grammar) That state of an adjective or adverb indicating simple quality, without comparison or relation to increase or diminution; as in wise, noble.

(optics) A doubly refracting crystal in which the index of refraction for the extraordinary ray is greater than for the ordinary ray, and the former is refracted nearer to the axis than the latter, such as quartz and ice; as opposed to negative crystal: one in which this characteristic is reversed, such as Iceland spar or tourmaline.

(computing) A signed magnitude representation of zero in which the sign bit indicates a positive number.

(chemistry) any isomer that differs from another isomer only in the position of a substituent, or of a double or triple bond

A position for sexual intercourse in which the man and woman face each other, with the man on top.

A result of a test that shows as present something that is absent. / (statistics) type I error

(medicine, bacteriology, of a bacterium) That is stained violet by Gram's method

A cross-legged sitting position in which the feet are resting on the thigh of the opposite leg; a meditative position in Hinduism and Buddhism, also used in yoga and sexual intercourse.

(biology) referring to an RNA strand that can serve directly as messenger RNA and be transcribed into DNA.

(advertising) One of four archetypal dramatic structures of commercials, characterized by an emotionally neutral beginning with an enormous leap in positive emotions generated by seeing the branded product in use.