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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91) Press and hold down the control key while you press '9'.
92) Knowledge is a measure, but practise is the key to it.
93) Love is a master key which opens the gate of happiness.
94) The key to acquiring proficiency in any task is repetition.
95) We had to break into the house as we had lost the key.
96) He jumbled up everything in the drawer to find his key.
97) The key was hanging on a nail by the door.
98) The key for happiness is not find a perfect person, but find someone and build a perfect relationship with him.
99) They have decided to hire outsiders for some of the key positions.
100) He inserted the key in the lock but could not open the door.
101) Don't be discouraged; it's often the last key in the bunch that opens the lock.
101) Sentencedict.com is a online sentence dictionary, on which you can find good sentences for a large number of words.
102) Paratroopers were dropped behind enemy lines to capture key points on the roads into the city.
103) Make sure you keep the key in a safe place.
104) He worked in the key and opened the door of the office.
105) China's support is key to the success of the coalition.
106) Enriched uranium is a key component of a nuclear weapon.
107) There were rumours that key witnesses had been paid off to keep quiet.
108) Highlight the area of text on screen and press the 'delete' key.
109) Would it be possible for me to have another room key?
110) The key for happiness is not to find a perfect person,(sentencedict.com) but find someone and build a perfect relationship with him.
111) The injury to their key player could be a decisive factor in the game.
112) The former chairman was a key player in the deals that pushed the bank to the top.
113) The exchange of prisoners of war was one of the key elements of the UN's peace plan.
114) Music and arts have always played the key role in my life.
115) If the door won't open, try jiggling the key in the lock.
116) "Start slowly" is the key phrase for the first-time marathon runner.
117) At these conventions, executives fraternized with the key personnel of other banks.
118) The key focus of the marketing mix will be on price and distribution.
119) Just hit the F5 function key to send and receive your e-mails.
120) The key fell from her suddenly nerveless fingers.