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(), 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 スポンサード リンク
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