If you have a notion that you can swim across the ocean, you are probably wrong. A notion is an idea, often vague and sometimes fanciful.
A notion is lighter than a theory and embraces a whimsy that a simple idea never could. You might have the notion that you can slow global warming by taking public transportation and reusing plastic bags. If you share a far-fetched idea with others, someone might respond with a "Where'd you get that notion?!" Notions can also refer to the buttons, thread, zippers, and pins necessary for sewing things. So if you have a notion to create your own Halloween costume, you better pick up some notions from the craft store.
Primary Meanings of notion
a general inclusive concept
(usually plural) small personal articles or clothing or sewing items
n a general inclusive concept
n a vague idea in which some confidence is placed
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the impression that something is present
an impression (especially one that is artificial or contrived)
at the first glimpse or impression
hunch, intuition, suspicion
an impression that something might be the case
an effect that imitates a sound called for in the script of a play
an effect used to produce scenes that cannot be achieved by normal techniques (especially on film)
the locus of feelings and intuitions