a new word, meaning, usage, or phrase.
the introduction or use of new words or new senses of existing words.
a new doctrine, especially a new interpretation of sacred writings.
Psychiatry. a new word, often consisting of a combination of other words, that is understood only by the speaker: occurring most often in the speech of schizophrenics.

1790–1800; < French néologisme. See neology, -ism

neologist, noun
neologistic, neologistical, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
neologism or neology (nɪˈɒləˌdʒɪzəm)
n , pl -gisms, -gies
1.  a newly coined word, or a phrase or familiar word used in a new sense
2.  the practice of using or introducing neologisms
3.  rare a tendency towards adopting new views, esp rationalist views, in matters of religion
[C18: via French from neo- + -logism, from Greek logos word, saying]
neology or neology
[C18: via French from neo- + -logism, from Greek logos word, saying]
ne'ologist or neology
neolo'gistic or neology
neolo'gistical or neology
neological or neology
neolo'gistically or neology
neo'logically or neology

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

"practice of innovation in language," 1800, from Fr. néologisme, from neo- + logos "word." Meaning "new word or expression" is from 1803. Neological is attested from 1754.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

neologism ne·ol·o·gism (nē-ŏl'ə-jĭz'əm)
A meaningless word used by a psychotic.

ne·ol'o·gis'tic or ne·ol'o·gis'ti·cal adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
To make it substantive and then pluralising it merely allows for a false identification as a neologism.
Please give me a strong incentive to keep reading your blog by avoiding the use of this awful neologism.
Five long lectures full of numbingly dense, abstraction-and-neologism-riddled prose await the reader.
The word is a neologism combining the tank of tank top with the end of the word bikini.
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