(trigonometry) The ratio of the side of a right-angled triangle opposite to a specified angle to the hypotenuse; when expressed as a real number between 0 and 1, it defines the sine of the angle.

plural of ratio variable

Alternative spelling of eudysmic ratio

(chemistry, pharmacology, biology) A ratio expressing the difference in pharmacologic activity between the two enantiomers of a drug.

(technology) ratio of the luminance of white to that of black of a display. A higher value means a higher contrast of white and black.

For a pixelated source, the ratio of the average distance between adjacent pixel sources to the average width of the pixel sources.

(geometry) A special number associated with an ordered quadruple of collinear points, particularly points on a projective line, and preserved by the fractional linear transformations.

(biology, sociology) The ratio of males to females in any given population.

(philosophy) “Right reason”, which regards virtue as desirable in itself.

(measurement, statistics) A scale of measurement of data having a fixed zero value, which permits the quantitative comparison of differences of values.