Synonym: answer, clue, explanation, lead, note, opener, pitch, tone. Similar words: turkey, hockey, monkey. Meaning: [kɪː] 
n. 1. metal device shaped in such a way that when it is inserted into the appropriate lock the lock's mechanism can be rotated 2. something crucial for explaining 3. pitch of the voice 4. any of 24 major or minor diatonic scales that provide the tonal framework for a piece of music 5. a kilogram of a narcotic drug 6. a winged often one-seed indehiscent fruit as of the ash or elm or maple 7. United States lawyer and poet who wrote a poem after witnessing the British attack on Baltimore during the War of 1812; the poem was later set to music and entitled `The Star-Spangled Banner' (1779-1843) 8. a coral reef off the southern coast of Florida 9. (basketball) a space (including the foul line) in front of the basket at each end of a basketball court; usually painted a different color from the rest of the court 10. a list of answers to a test 11. a list of words or phrases that explain symbols or abbreviations 12. a generic term for any device whose possession entitles the holder to a means of access 13. mechanical device used to wind another device that is driven by a spring (as a clock) 14. the central building block at the top of an arch or vault 15. a lever that actuates a mechanism when depressed. v. 1. identify as in botany or biology, for example 2. provide with a key 3. vandalize a car by scratching the sides with a key 4. regulate the musical pitch of 5. harmonize with or adjust to. adj. 1. serving as an essential component 2. effective; producing a desired effect.
n. 1. metal device shaped in such a way that when it is inserted into the appropriate lock the lock's mechanism can be rotated 2. something crucial for explaining 3. pitch of the voice 4. any of 24 major or minor diatonic scales that provide the tonal framework for a piece of music 5. a kilogram of a narcotic drug 6. a winged often one-seed indehiscent fruit as of the ash or elm or maple 7. United States lawyer and poet who wrote a poem after witnessing the British attack on Baltimore during the War of 1812; the poem was later set to music and entitled `The Star-Spangled Banner' (1779-1843) 8. a coral reef off the southern coast of Florida 9. (basketball) a space (including the foul line) in front of the basket at each end of a basketball court; usually painted a different color from the rest of the court 10. a list of answers to a test 11. a list of words or phrases that explain symbols or abbreviations 12. a generic term for any device whose possession entitles the holder to a means of access 13. mechanical device used to wind another device that is driven by a spring (as a clock) 14. the central building block at the top of an arch or vault 15. a lever that actuates a mechanism when depressed. v. 1. identify as in botany or biology, for example 2. provide with a key 3. vandalize a car by scratching the sides with a key 4. regulate the musical pitch of 5. harmonize with or adjust to. adj. 1. serving as an essential component 2. effective; producing a desired effect. 
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271) The key was lost, so we had to smash the door open.
272) The key issue was whether the four defendants acted dishonestly.
273) In a key speech, the Queen indicated she was willing to pay tax.
274) He rammed the key into the lock and kicked the front door open.
275) With the loyalty of key military units in question, that could prove an extraordinarily difficult task.
276) His nimble mind calculated the answer before I could key the numbers into my computer.
277) England's attack has been weakened by the injury of certain key players.
278) A computer can soak up all you key into it.
279) The movement is supported by key figures in the three main political parties.
280) I'll post the key through your letterbox when I leave.
281) The need to communicate is a key characteristic of human society.
282) First my car broke down, then I lost my key: it never rains but it pours!
283) They should put him in prison and throw away the key!
284) Experts agree that a balanced diet is the key to great health.
285) I hope he's got the wit to take the key with him.
286) For a beach resort with a difference[sentencedict.com], try Key West.
287) Prisoners are kept under lock and key 24 hours a day.
288) Despite losing key players to injury, the team managed to remain undefeated in the final weeks of the season.
289) They believe that a fundamental change in the governance of Britain is the key to all other necessary changes.
290) He went through all his pockets looking for his key.
291) The driver of the car probably holds the key to solving the crime.
291) Sentencedict.com is a online sentence dictionary, on which you can find nice sentences for a large number of words.
292) Put the key in the ignition and turn it to start the car up.
293) The files are now in a safe to which only he has the key.
294) I took the key for the room off a rack above her head.
295) For the sake of clarity she went back over the key points.