1. near-earth object.

Other definitions for neo- (2 of 2)


  1. a combining form meaning “new,” “recent,” “revived,” “modified,” used in the formation of compound words: neo-Darwinism; Neolithic; neoorthodoxy; neophyte.

  2. Chemistry. a combining form used in the names of isomers having a carbon atom attached to four carbon atoms: neoarsphenamine.

Origin of neo-

<Greek, combining form of néos; akin to new
  • Also especially before a vowel, ne-. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use NEO in a sentence

British Dictionary definitions for neo-


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

Origin of neo-

from Greek neos new

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012