/ Dictionary / Index M methanation: Meaning and Definition of Find definitions for: meth•a•na•tion Pronunciation: (meth"u-nā'shun), [key] — n. Chem. the process of converting a mixture, as of hydrogen and carbon monoxide, into methane. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. methanal methane Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language