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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61) A key task is to get pupils to perceive for themselves the relationship between success and effort.
62) Natural selection is a key element of Darwin's theory of evolution.
63) A key word index is an enlargement to the book.
64) Give away any food you have on hand, or lock it up and give the key to the neighbours.
65) The clerk checked us in and gave us our key.
66) Troops were reported to be guarding the key points there.
67) The service had planted its agents and informers in some key positions in industry.
68) He took a small key from his pocket and slowly inserted it into the lock.
69) Sometimes, the key to making progress is to recognize how to take that very first step. Then you start your journey.
70) The company has developed sales through local agents in key markets.
71) The key to a happy life is to accept you are never actually in control.
72) Sometimes(sentence dictionary), all it takes is a little key to open the door to the wild side.
73) There is no key to happiness.The door is always open.
74) 'Why don't you try the other key?' 'That's a thought!'
75) His hand shook slightly as he inserted the key into the lock.
76) The cabinet comes with locks and key and is shaped like a cube.
77) She carried her car keys on an ostentatious gold key ring.
78) Have you heard that Smith passed for the key senior middle school?
79) The Tories are concentrating their campaign in the key marginal constituencies.
80) Is it all right if I have another room key?
81) The key question of what caused the leak remains unanswered.
82) She would keep any sensitive documents under lock and key.
83) Where's the goddamn key?
84) When you vacate the room,(sentencedict.com) you should hand over the door key to me.
85) He has been criticized for flip-flopping on several key issues.
86) By means of pedals, a harp can be set in any desired key.
87) Exercise is one of the key components of a healthy lifestyle.
88) We have a key for the door of the house and a key for starting the car.
89) Florida was a key state in his campaign for re-election.
90) When poorer people use credit, mail order is the key source.