(motor racing) The top qualifying position for a race, on the inside of the front row at the starting line. / (by extension) First place.

(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.

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

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

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

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

(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.

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