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expansion definition

ex·pan·sion (-s̸hen)

noun

  1. an expanding or being expanded; enlargement; dilation
  2. an expanded thing or part
  3. the amount, degree, or extent of expansion
  4. a development or full treatment, as of a topic
  5. the process or result of working out or giving the full form of a contraction, equation, etc.
  6. Mech. the expanding in volume of steam in the cylinder of a steam engine after cutoff, or of gas in the cylinder of an internal-combustion engine after explosion

Etymology: LL expansio < L expansus: see expanse

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