Part of speech: Noun
the content of cognition; the main thing you are thinking about
Example: it was not a good idea; the thought never entered my mind
Categories: Content, Cognitive content, Mental object
Part of speech: Noun
a personal view
Example: he has an idea that we don't like him
Categories: Opinion, Sentiment, Persuasion, View, Thought
Approximation, Theme, Mind, Estimate, Melodic theme
The word "idea" comes from Proto-Indo-European *weyd-, which comes from Ancient Greek ἰδέα, which was borrowed from Latin idea. Many other languages have similar words:
idée – A related word in the same word family.
A word passing through this many languages survived because it named something universally important.