FluentPlex

key

/ki/ adjective A1
  1. Indispensable, supremely important. · He is the key player on his soccer team.
  2. Important, salient. · She makes several key points.

Comparative keyer · Superlative keyest

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He is one of two who have a key of the safe.
Sherlock Holmes: The Bruce-Partington Plans, p. 9 · B2
I may add that the papers were undoubtedly in the office during working hours on Monday, and that Sir James left for London about three o’clock taking his key with him.
Sherlock Holmes: The Bruce-Partington Plans, p. 9 · B2
“Who was the other man with a key?”
Sherlock Holmes: The Bruce-Partington Plans, p. 10 · B2
According to his own account, corroborated only by the word of his wife, he was at home the whole of Monday evening after office hours, and his key has never left the watch-chain upon which it hangs.”
Sherlock Holmes: The Bruce-Partington Plans, p. 10 · B2

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Words, meanings, pronunciations and translations from Wiktionary (CC BY-SA 4.0); how common each word is from wordfreq. Made into this dictionary by FluentPlex.