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Scale, n.

1. A ladder; a series of steps; a means of ascending. [Obs.]

2. Hence, anything graduated, especially when employed as a measure or rule, or marked by lines at regular intervals. Specifically: (a) A mathematical instrument, consisting of a slip of wood, ivory, or metal, with one or more sets of spaces graduated and numbered on its surface, for measuring or laying off distances, etc., as in drawing, plotting, and the like. See Gunter's scale. (b) A series of spaces marked by lines, and representing proportionately larger distances; as, a scale of miles, yards, feet, etc., for a map or plan. (c) A basis for a numeral system; as, the decimal scale; the binary scale, etc. (d) Mus. The graduated series of all the tones, ascending or descending, from the keynote to its octave; -- called also the gamut. It may be repeated through any number of octaves. See Chromatic scale, Diatonic scale, Major scale, and Minor scale, under Chromatic, Diatonic, Major, and Minor.

3. Gradation; succession of ascending and descending steps and degrees; progressive series; scheme of comparative rank or order; as, a scale of being.

*There is a certain scale of duties . . . which for want of studying in right order, all the world is in confusion.* --*Milton.*

4. Relative dimensions, without difference in proportion of parts; size or degree of the parts or components in any complex thing, compared with other like things; especially, the relative proportion of the linear dimensions of the parts of a drawing, map, model, etc., to the dimensions of the corresponding parts of the object that is represented; as, a map on a scale of an inch to a mile.

**Scale of chords**, a graduated scale on which are given the lengths of the chords of arcs from 0° to 90° in a circle of given radius, -- used in measuring given angles and in plotting angles of given numbers of degrees.

Chro·mat·ic a.

1. Relating to color, or to colors.

2. Mus. Proceeding by the smaller intervals (half steps or semitones) of the scale, instead of the regular intervals of the diatonic scale.

Note: ☞ The intermediate tones were formerly written and printed in colors.

**Chromatic aberration**. Opt. See Aberration, 4.

**Chromatic printing**, printing from type or blocks covered with inks of various colors.

**Chromatic scale** Mus., the scale consisting of thirteen tones, including the eight scale tones and the five intermediate tones.

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From: WordNet (r) 2.0

chromatic scale

n : a 12-note scale including all the semitones of the octave