Webster
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Webster’s Revised Unabridged Dictionary · 1913

Progression

Pro·gres′sion (prō·grĕsh′ŭn), n. [L. progressio: cf. F. progression.]

1. The act of moving forward; a proceeding in a course; motion onward.

2. Course; passage; lapse or process of time.

I hope, in a short progression, you will be wholly immerged in the delices and joys of religion. Evelyn.

3. (Math.) Regular or proportional advance in increase or decrease of numbers; continued proportion, arithmetical, geometrical, or harmonic.

4. (Mus.) A regular succession of tones or chords; the movement of the parts in harmony; the order of the modulations in a piece from key to key.

Arithmetical progression, a progression in which the terms increase or decrease by equal differences, as the numbers {2, 4, 6, 8, 10
10, 8, 6, 4, 2} by the difference 2.

— Geometrical progression, a progression in which the terms increase or decrease by equal ratios, as the numbers {2, 4, 8, 16, 32, 64
64, 32, 16, 8, 4, 2} by a continual multiplication or division by 2.

— Harmonic progression, a progression in which the terms are the reciprocals of quantities in arithmetical progression, as ½, ¼, 1⁄6, 1⁄8, 1⁄10.

Webster’s Revised Unabridged Dictionary, Noah Porter, editor (Springfield, Mass.: G. & C. Merriam, 1913). Public domain. Text as transcribed by MICRA, Inc., from Project Gutenberg. Changed for Deep Dive Bible: Greek, which our source spelled in Latin letters, set in Greek letters; entries of one spelling merged into one article; Greek words our source left out (shown as “?”), read from the 1898 printing, from the same plates (the Library of Congress’s copy), where the place could be found with certainty. Of the others, 1,362 (a word or a single letter each) were inferred by AI from the context by the dictionary’s own rules and are marked with a wavy underline (tap or point at one to see the note); the rest, which could not be inferred with confidence, are left as “?”.