/ Dictionary / Index L lactation: Meaning and Definition of Find definitions for: lac•ta•tion Pronunciation: (lak-tā'shun), [key] — n. the secretion or formation of milk. the period of milk production. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: lactation (Thesaurus) lactate dehydrogenase lacteal Related Content Daily Word Quiz: abdicate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language