notion

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

1.
n
a general inclusive concept
2.
n
(usually plural) small personal articles or clothing or sewing items
Full Definitions of notion
1

n a general inclusive concept

Types:
mumpsimus
a traditional notion that is obstinately held although it is unreasonable
Type of:
concept, conception, construct
an abstract or general idea inferred or derived from specific instances

n a vague idea in which some confidence is placed

Synonyms:
belief, feeling, impression, opinion
Types:
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presence
the impression that something is present
effect
an impression (especially one that is artificial or contrived)
first blush
at the first glimpse or impression
hunch, intuition, suspicion
an impression that something might be the case
sound effect
an effect that imitates a sound called for in the script of a play
special effect
an effect used to produce scenes that cannot be achieved by normal techniques (especially on film)
bosom, heart
the locus of feelings and intuitions
Type of:
idea, thought
the content of cognition; the main thing you are thinking about

n an odd or fanciful or capricious idea

“the theatrical notion of disguise is associated with disaster in his stories”
Synonyms:
whim, whimsey, whimsy
Type of:
idea, thought
the content of cognition; the main thing you are thinking about
2

n (usually plural) small personal articles or clothing or sewing items

“buttons and needles are notions
Types:
ribbon
notion consisting of a narrow strip of fine material used for trimming
riband, ribband
a ribbon used as a decoration
Type of:
article
one of a class of artifacts