a general understanding; vague or imperfect conception or idea of something: a notion of how something should be done.
an opinion, view, or belief: That's his notion, not mine.
conception or idea: his notion of democracy.
a fanciful or foolish idea; whim: She had a notion to swim in the winter.
an ingenious article, device, or contrivance; knickknack.
notions, small articles, as buttons, thread, ribbon, and other personal items, especially such items displayed together for sale, as in a department store.

1560–70; < Latin nōtiōn- (stem of nōtiō) examination, idea, equivalent to nōt(us) past participle of nōscere (see notify) + -iōn- -ion

notionless, adjective

1, 3. See idea. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
notion (ˈnəʊʃən)
1.  a vague idea; impression
2.  an idea, concept, or opinion
3.  an inclination or whim
[C16: from Latin nōtiō a becoming acquainted (with), examination (of), from noscere to know]

notions (ˈnəʊʃənz)
pl n
chiefly (US), (Canadian) pins, cotton, ribbon, and similar wares used for sewing; haberdashery

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1533 (implied in notional), from L. notionem (nom. notio) "concept," from notus, pp. of noscere "come to know" (see know). Coined by Cicero as a loan-translation of Gk. ennoia "act of thinking, notion, conception," or prolepsis "previous notion, previous conception." Notions
"miscellaneous articles" (1805, Amer.Eng.) springs from the idea of "clever invention."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
These are not unreasonable notions, but there is also no positive evidence to
  suggest that they are correct, either.
To recognize them you have to shed your pre-9/11 notions and embrace today's
  travel reality.
As the disease took on the dimensions of a plague, it swept away notions that
  great pandemics belong to history.
Some astoundingly dark and retrograde notions openly circulate in reactionary
  churches and on nationalist websites.
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