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compression

com·pres·sion

compression

 
pronunciation:
km pre shn
part of speech: noun
definition 1: the act or process of pressing down on or together, causing flattening or condensing.
The underlying layers of rock were flattened by compression.
similar words:
abridgment
definition 2: the state or result of being compressed.
similar words:
abbreviation, abridgment
definition 3: the reduction in volume and increase in pressure of air or air mixed with fuel in the cylinder of an internal combustion engine prior to ignition, or the engine cycle in which this process takes place.
derivation: compressional (adj.)