key

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key

adjective 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.

References in classic literature ?
When the sound of their footsteps had died away, Dorian locked the door and put the key in his pocket.
Before leaving the room again she acted on Lady Montbarry's advice, and tried the key in the lock of the dressing-room door.
Musing on these things the girl put the key in the pocket of her dress and then slowly drew on her shoes and stockings, which the sun had fully dried.