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idea

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idea/aɪˈdiːjə/noun
pluralideas
idea
/aɪˈdiːjə/
noun
pluralideas
Learner's definition of IDEA  
[count]  : a thought, plan, or suggestion about what to do
[count]  : an opinion or belief
: something that you imagine or picture in your mind
[count]
[noncount]
[singular]  : an understanding of something : knowledge about something
the idea  : the central meaning or purpose of something

give someone ideas

orput ideas in/into someone's head
: to cause someone to think about doing something that probably should not be done
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