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Definitions

key

[kee] / ki /


NOUN
item that unlocks
Synonyms
Antonyms




Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

While the first prototype was relatively basic, its future models also pioneered wearable health tech with features like ECG monitoring and fall detection, making it a key driver of health and fitness technology.

From BBC • Apr. 4, 2026

She didn’t specify what mistake she made but said her apology was a key step in continuing to build trust with this team.

From Los Angeles Times • Apr. 4, 2026

Most loans carry floating rates tied to SOFR, the key short rate benchmark, with an average margin of about five percentage points.

From Barron's • Apr. 4, 2026

Touted for years by Musk as the key to taking humans to Mars, SpaceX is now looking to show that Starship can work, including by lofting the company’s own satellites into orbit.

From The Wall Street Journal • Apr. 4, 2026

“You carry more than one key, do you not?”

From "The Way to Rio Luna" by Zoraida Cordova