lith·i·fi·ca·tion (l?th??-f?-k??sh?n)n. The process by which compacted sediment loses liquid and turns into stone.lith?i·fied adj.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.lithification (?l???f??ke???n) n (Geological Science) the consolidation of a loosely deposited sediment into a hard sedimentary rockCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014lith?i?fi?ca?tion (?l?? ? f??ke? ??n) n. the process or processes by which unconsolidated materials are converted into coherent solid rock, as by compaction. [1870?75;