a combining form meaning “new,” “recent,” “revived,” “modified,” used in the formation of compound words: neo-Darwinism; Neolithic; neoorthodoxy; neophyte.
Chemistry. a combining form used in the names of isomers having a carbon atom attached to four carbon atoms: neoarsphenamine.
Also, especially before a vowel, ne-.

< Greek, combining form of néos; akin to new Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
neo- or (sometimes before a vowel) ne-
combining form
1.  (sometimes capital) new, recent, or a new or modern form or development: neoclassicism; neocolonialism
2.  (usually capital) the most recent subdivision of a geological period: Neogene
[from Greek neos new]
ne- or (sometimes before a vowel) ne-
combining form
[from Greek neos new]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

Gk. neo-, comb. form of neos "new," from PIE base newos (see new). Used in a seemingly endless number of adjectives and nouns, mostly coined since c.1880.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

neo- pref.

  1. New; recent: neonatal.

  2. New and different: Neo-Freudian.

  3. New and abnormal: neoplasm.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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