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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121) Try turning the key a trifle .
122) Key components of the government's plan are ...
123) I couldn't find a key which fitted the lock.
124) This piece changes key many times.
125) For some reason, the key wouldn't turn.
126) She transposed the song into a different key.
127) Will you return my car key?
128) A key was enclosed in the envelope.
129) It's not easy to pass into this key university.
130) I don't know the key to the puzzle.
131) The criminals are now safely under lock and key.
132) I selected a file and pressed the Delete key.
133) To load the file,(www.Sentencedict.com) press the 'return' key.
134) The key turned stiffly in the lock.
135) The conference examined key issues relating to the reform.
136) I'll leave a key with the neighbours, all right?
137) You need a key to open the garage.
138) I must have left my key in the ignition.
139) We've lost two key players through injury.
140) This is the place where I hid the key.
141) They zeroed in on the key issues.
142) The key sticks in the lock.
143) He frantically searched for the key.
144) Key in your password and press 'Return'.
145) The key stuck in the lock.
146) She rammed the key into the lock.
147) Key decisions are always taken by the editor.
148) Do you remember where you put the key?
149) I can't get in I've lost the perishing key!
150) Turn the key in an anticlockwise direction.