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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31) Cost was a key element in our decision.
32) I'd like to leave my room key, pls.
33) I'd steeked your car's doors. Here's the key.
34) What's the key to your success?
35) Doubt is the key to knowledge.
36) This is a key feature of our society.
37) I forgot my key inside my room.
38) Could I possibly have another room key?
39) She turned the key in the lock.
40) We'll have a duplicate key cut .
41) Teamwork is a key feature of the training programme.
41) Wish you can benefit from our online sentence dictionary and make progress day by day!
42) The used key is the most bright.
43) She groped for her key in her bag.
44) We are falling about the lost key.
45) He assumed direct control of key ministries.
46) I heard someone turn a key in the lock.
47) Two key witnesses at her trial committed perjury.
48) The key doesn't fit the lock.
49) He concealed the key inside his tie.
50) May I have another room key?
51) Thank God you found the key.
52) Could I please have another room key?
53) Where's the key for turning off the radiator?
54) Gibraltar is the key to the Mediterranean.
55) Love is the master key that opens the gates of happiness.
56) The company's restructuring is designed to give a sharper focus on key growth markets.
57) I'll give you a key then you're free to come and go as you please.
58) The key turned in the lock with a loud metallic click.
59) The key is hanging on a string by the door.
60) In life, patience is the key. It's much better to be going somewhere slowly than nowhere fast.