Pro·grēs'sion, n.
(-grēsh'un), n. [Lat. progressio, Fr. progression, Sp. progresión, It. progressione.]
Sense 1. The act of moving forward; a proceeding in a course; motion onward.
Sense 2. Course; passage; lapse or process of time.
I hope, in a short progression, you will be wholly immersed in the delices and joys of religion. Evelyn.
Sense 3. (Math.) Regular or proportional advance in increase or decrease of numbers; continued proportion, arithmetical, geometrical, or harmonical.
Sense 4. (Mus.) A regular succession of chords, or movement of the parts in harmony.
Arithmetical progression, a progression in which the terms increase or decrease by equal differences, as the numbers
2, 4, 6, 8, 10, } by the difference 2. 10, 8, 6, 4, 2, }
— Geometrical progression, a progression in which the terms increase or decrease by equal ratios, as the numbers
2, 4, 8, 16, 32, 64, } by a continual multiplication or division by 2. 64, 32, 16, 8, 4, 2, }
— Harmonical progression, a progression in which the terms are the reciprocals of quantities in arithmetical progression, as ½, ¼, ⅙, ⅛, ⅒.