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keyadjective critical, crucial, decisive, fateful, influential, major, momentous, significant, weighty
key(Passport), noun bar, pass, permit, ticket
key(Solution), noun answer, method, resolution, way
See also: answer, basic, cardinal, catchword, central, clue, cornerstone, critical, crucial, essential, explanation, fundamental, gravamen, important, indispensable, main point, major, material, necessary, outstanding, primary, solution, strategic, tip
KEY. An instrument made for shutting and opening a lock.
2. The keys of a house are considered as real estate, and descend to the heir with the inheritance. But see 5 Blackf. 417.
3. When the keys of a warehouse are delivered to a purchaser of goods locked up there, with a view of effecting a delivery of such goods, the delivery is complete. The doctrine of the civil law is the same. Dig. lib. 41, t. 1, 1. 9, Sec. 6; and lib. 18, t. 1, 1. 74.
KEY, estates. A wharf at which to land goods from, or to load them in a vessel. This word is now generally spelled Quay, from the French, quai.