/ Dictionary / Index L lock-in: Meaning and Definition of Find definitions for: lock-in Pronunciation: (lok'in"), [key] — n. an act or instance of becoming unalterable, unmovable, or rigid. commitment, binding, or restriction. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: lock-in (Thesaurus) Lockhart locking piece Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language