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Definition of expansion : 1. Enlargement or extension of business transactions; esp., increase of the circulation of bank notes.
2. Space through which anything is expanded; also, pure space.
3. That which is expanded; expanse; extend surface; as, the expansion of a sheet or of a lake; the expansion was formed of metal.
4. The act of expanding or spreading out; the condition of being expanded; dilation; enlargement.
5. The developed result of an indicated operation; as, the expansion of ( a + b) 2 is a2 + 2ab + b2.
6. The enlargement of the ship mathematically from a model or drawing to the full or building size, in the process of construction.
7. The operation of steam in a cylinder after its communication with the boiler has been cut off, by which it continues to exert pressure upon the moving piston.

Synonyms:

working out, intricacy, expanse, distance, involution, elaborateness, place, spread, reach, space, stretch, sweep, refinement, expanding upon, elaboration, blowup, extent

addition, augmentation, accrual, increment, attainment, acquisition, accumulation, increase, aggregation, enlargement

growth, extension, inflation, magnification, multiplication, elevation

crescendo, broadening, engorgement, dilation, lengthening, fattening, thickening, spreading, burgeoning, development, stretching, widening, amplification, distension, swelling

Usage examples:

• The amount of expansion due to hardening is variable, but increases with the thickness of the die. - "Modern Machine-Shop Practice, Volumes I and II", Joshua Rose.
• Equally momentous were the times in Europe, where the attempt to secure opportunities of expansion as well as larger liberty for the individual took quite different form. - "Edison, His Life and Inventions", Frank Lewis Dyer and Thomas Commerford Martin.
• The growth and expansion of the Negro population in the United States must be the controlling factor in the many complex problems to which his presence gives rise. - "The Negro and the elective franchise. A Series Of Papers And A Sermon (The American Negro Academy. Occasional Papers, No. 11.)", Archibald H. Grimké, Charles C. Cook, John Hope, John L. Love, Kelly Miller, and Rev. Frank J. Grimké.