Meaning of coalification

coal•i•fi•ca•tion

Pronunciation: (kō"lu-fi-kā'shun), [key]
— n. Geol.
  1. the conversion of plant material into coal by natural processes, as by diagenesis and, in some instances, metamorphism.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.