/keuhm pak"sheuhn, kom-/ , n.
1. the act of compacting or the state of being compacted.
2. Geol. the consolidation of sediments resulting from the weight of overlying deposits.
[ 1350-1400; ME compaccioun compaction- (s. of compactio ) a joining, frame, equiv. to compact ( us ) COMPACT 1 + -ion- -ION ]