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. 
Random good picture Not show
241) The key to the army's effectiveness is its increased mobility.
242) The key for the eighty-year-old professor to keep fit is to jog three kilometres every morning.
243) Check your answers in the key at the back of the book.
244) I can't force the key into this lock, it won't fit.
245) Someone's gone and locked the door and I haven't got a key!
246) Messages encrypted using the public key can be decrypted only by someone with the private key.
247) Gently sand the plastic to provide a key for the paint.
248) The State Recreation Area sprawls over 900 acres on the southern tip of Key Biscayne.
249) Don't ask your father which key to press - he hasn't got a clue about computers.
250) It had completely slipped her mind that Dave still had a key to the house.
251) I'll find the key eventually. It's just a question of time.http://Sentencedict.com
252) Nearly all of the young people interviewed believed that work was the key to success.
253) I was poking about in the drawer, looking for the key, when I found this!
254) He was under instructions to guard the key with his life.
255) A key is the part of a pianoforte that you touch to make music.
256) She let herself into the flat with the spare key.
257) I think there is one key fact that you have overlooked.
258) It's always been known that key figures in the government do very well for themselves.
259) The key articles of the constitution can only be changed by referendum.
260) He could be depended on to take a moderate position on most of the key issues.
261) One of our key employees had been poached by another company.
262) He locked the heavy door securely and kept the key in his pocket.
263) The key to success is to be ready from the start.
264) We should be in when you arrive, but if the worst comes to the worst, the neighbours have a spare key and will let you into the house.
265) The negotiations have got stuck on a number of key issues.
266) These units played a key functional role in the military operation.
267) The key word here is diversify; don't put all your eggs in one basket.
268) At that moment he heard Gill's key turning in the lock of the door.
269) Use the Tab key to indent the first line of the paragraph.
270) He proved overconfident on the witness stand, misremembering a key piece of evidence.