COMPACTION
n.The act of making compact; or the state of being compact.
Com *pac "tion, n. Etym: [L. compactio.]
compaction
com pac tion /kəmpǽkʃ (ə )n /名詞 U 1 (物の )凝縮, 圧縮 .2 (土壌などが )固まること .