"compressions" in the noun sense
1. compaction, compression, concretion, densification
an increase in the density of something
2. compression, condensation, contraction
the process or result of becoming smaller or pressed together
"the contraction of a gas on cooling"
3. compression
encoding information while reducing the bandwidth or bits required
4. compression, compressing
applying pressure
Source: WordNet® (An amazing lexical database of English)
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