Meaning : An increase in the density of something.
Synonyms : compaction, concretion, densification
Meaning : The process or result of becoming smaller or pressed together.
							Example : 
							The contraction of a gas on cooling.
							
Synonyms : condensation, contraction
Meaning : Encoding information while reducing the bandwidth or bits required.
Restoring compressed information to its normal form for use or display.
decompressionMeaning : Applying pressure.
Synonyms : compressing
Relieving pressure (especially bringing a compressed person gradually back to atmospheric pressure).
decompressing, decompression