Yes, notion is a Scrabble word!
...and is worth 6 points in Scrabble, and 8 points in Words with Friends
notion
Noun
1. A vague idea in which some confidence is placed
2. A general inclusive concept
3. An odd or fanciful or capricious idea
4. (usually plural) small personal articles or clothing or sewing items
What Scrabble words can I make with the letters in notion?
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Words that can be created with an extra letter added to notion:
S:notions