Progression \Pro*gres"sion\, n. [L. progressio: cf. F. progression.]

[1913 Webster]

1. The act of moving forward; a proceeding in a course; motion onward. [1913 Webster]

2. Course; passage; lapse or process of time. [1913 Webster]

I hope, in a short progression, you will be wholly immerged in the delices and joys of religion. --Evelyn. [1913 Webster]

3. (Math.) Regular or proportional advance in increase or decrease of numbers; continued proportion, arithmetical, geometrical, or harmonic. [1913 Webster]

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. [1913 Webster]

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. [1913 Webster]

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. [1913 Webster]

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. [1913 Webster]

Source: The Collaborative International Dictionary of English v.0.48
 

157 Moby Thesaurus words for "progression": Great Leap Forward, Indian file, accomplishment, advance, advancement, alternation, amelioration, amendment, amplification, array, articulation, ascension, ascent, bank, bettering, betterment, blossoming, boost, broadening, buzz, catena, catenation, chain, chain reaction, chaining, coming after, concatenation, connection, consecution, consecutiveness, continualness, continuance, continuation, continuity, continuum, course, cycle, descent, development, developmental change, drone, elaboration, elevation, endless belt, endless round, endurance, enhancement, enlargement, enrichment, eugenics, euthenics, evolution, evolutionary change, evolvement, evolving, expansion, explication, extending, extension, file, filiation, flow, flowering, following, furtherance, gamut, geometrical progression, gradation, gradual change, growth, headway, hum, improvement, intensification, lengthening, lift, line, lineage, logical sequence, maintenance, maturation, melioration, mend, mending, monotone, natural development, natural growth, nexus, nonviolent change, order, order of succession, pendulum, periodicity, perpetuation, perseverance, persistence, pickup, plenum, posteriority, postposition, powder train, preferment, procession, progress, prolongation, promotion, protraction, pursuance, queue, range, rank, recovery, recurrence, repetition, restoration, reticulation, revival, ripening, rise, rotation, round, routine, row, run, scale, sequel, sequence, series, single file, spectrum, spread, spreading, staying power, straight course, string, subjunction, succession, successiveness, suffixation, sustained action, sustenance, swath, thread, tier, train, unfolding, uninterrupted course, unremittingness, upbeat, upgrowth, uplift, upping, upswing, uptrend, upward mobility, way, windrow

Source: Moby Thesaurus II by Grady Ward, 1.0
 

progression

Source: WordNet (r) 2.0
 

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.

Source: Webster's Revised Unabridged Dictionary (1913)
 

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.

Source: Webster's Revised Unabridged Dictionary (1913)