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more about progression
## progression |

3 definitions found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Progression \Pro*gres"sion\, 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 [lbrace2]2, 4, 6, 8, 1010, 8, 6, 4, 2[rbrace2] by the difference 2. {Geometrical progression}, a progression in which the terms increase or decrease by equal ratios, as the numbers [lbrace2]2, 4, 8, 16, 32, 6464, 32, 16, 8, 4, 2[rbrace2] 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 1/2, 1/4, 1/6, 1/8, 1/10. From Webster's Revised Unabridged Dictionary (1913) [web1913]: the motion of the point A, of the foot of the perpendicular PA when P moves uniformly in the circumference of a circle, and PA is drawn perpendicularly upon a fixed diameter of the circle. This is simple harmonic motion. The combinations, in any way of two more simple harmonic motions, make other kinds of harmonic motion. The motion of the pendulum bob of a clock is approximately simple harmonic motion. {Harmonic proportion}. See under {Proportion}. {Harmonic series} or {progression}. See under {Progression}. {Spherical harmonic analysis}, a mathematical method, sometimes referred to as that of Laplace's Coefficients, which has for its object the expression of an arbitrary, periodic function of two independent variables, in the proper form for a large class of physical problems, involving arbitrary data, over a spherical surface, and the deduction of solutions for every point of space. The functions employed in this method are called spherical harmonic functions. --Thomson & Tait. {Harmonic suture} (Anat.), an articulation by simple apposition of comparatively smooth surfaces or edges, as between the two superior maxillary bones in man; -- called also {harmonic}, and {harmony}. {Harmonic triad} (Mus.), the chord of a note with its third and fifth the common chord. From WordNet r 1.6 [wn]: progression n 1: a series with a definite pattern of advance [syn: {patterned advance}] 2: a movement forward; "he listened for the progress of the troops" [syn: {progress}, {advance}] 3: the act of moving forward toward a goal [syn: {progress}, {advance}, {advancement}, {forward motion}, {onward motion}]

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