noun Geology.
the process or processes by which unconsolidated materials are converted into coherent solid rock, as by compaction or cementation.
Also called induration.

1870–75; lith- + -i- + -fication Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
lithification (ˌlɪθɪfɪˈkeɪʃən)
the consolidation of a loosely deposited sediment into a hard sedimentary rock

Collins English Dictionary - Complete & Unabridged 10th Edition
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Cite This Source's 21st Century Lexicon
Main Entry:  lithification
Part of Speech:  n
Definition:  the process by which unconsolidated sediments are converted into solid stone or rock; also called induration
Example:  Compaction and cementation are two methods contributing to lithification.
Etymology:  Greek lithos 'rock''s 21st Century Lexicon
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Example sentences
Cementation: the phase of lithification where cement fills the voids between
  grains attaching them to each other.
The sediments which surrounded these remains eventually turned to rock through
  the process of lithification.
Upon lithification, these sediments become limestone.
Little primary porosity and permeability remain in these rocks after the
  process of lithification.
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