'Compaction' definitions:

Definition of 'compaction'

(from WordNet)
noun
An increase in the density of something [syn: compaction, compression, concretion, densification]
noun
The act of crushing [syn: crush, crunch, compaction]

Definition of 'Compaction'

From: GCIDE
  • Compaction \Com*pac"tion\, n. [L. compactio.] The act of making compact, or the state of being compact. [Obs.] --Bacon. [1913 Webster]