A key is used by placing the key into the slot of the thing you want to unlock. A key that can open more than one lock (if each lock also has its own key) is called a master key or skeleton key. Discover the word "KEY" in English: definitions, translations, synonyms, pronunciations, examples, and grammar insights - all in one complete resource. 5 days ago ยท The meaning of KEY is a usually metal instrument that is used to open a lock or to start or access a mechanism. How to use key in a sentence. a piece of metal that has been cut into a special shape and is used for opening or closing aโ€ฆ. Language is the key to understanding those around you. (especially North American English) The key is, how long can the federal government control the inflation rate? Of crucial importance; significant: key decisions; the key element of the thesis.

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