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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151) The key to his success is his logical mind.
152) Boil the report down to the key points.
153) Hard work is the key to success.
154) Oh hell, I've forgotten my key!
155) Please turn the key in a clockwise direction.
156) Write to P.O. Box 714, Key Largo, Florida.
157) Can we try it in a lower key?
158) He must have purloined a key from somewhere.
159) The Minister was proving unbending on key issues.
160) She must have used a key to get in.
161) Please leave your key at the reception desk .
161) Wish you can benefit from sentencedict.com and make progress everyday!
162) Labour lost two of the key marginals in London.
163) The speech he made stuck to the key points.
164) You should key up your endeavour to achieve sucess.
165) And herein lies the key to their achievements.
166) The key of E flat major has three flats.
167) Key in the file name and press return.
168) He cried that he had found the key.
169) He could have taken a spare key.
170) Turn the key anticlockwise / in an anticlockwise direction.
171) The key tells you what all the symbols mean.
172) He turned the ignition key.
173) They zeroed in on the key issues for discussion.
174) He was a key figure in the campaign.
175) 'Caution' is the key word in this situation.
176) Diet and exercise are the key .
177) I always took my key out of my bag and put it in my pocket.
178) I've forgotten my front-door key, so we'll have to use the tradesmen's entrance.
179) The key question in British politics was how long the prime minister could survive.
180) Turn a special key, press the brake pedal, and your car's brakes lock.