NEO

¹ American

abbreviation

near-earth object.

neo- ² American

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.

neo- British

combining form

(sometimes capital) new, recent, or a new or modern form or development

neoclassicism
neocolonialism
(usually capital) the most recent subdivision of a geological period

Neogene

"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

Etymology

Origin of neo-

< Greek, combining form of néos; akin to new

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

He was told his B negative blood-type or NEO blood - was rare and he could help babies in neonatal intensive care.

From BBC • Apr. 1, 2026

He has even ordered a NEO humanoid robo External link t from 1X, but isn’t expecting much.

From Barron's • Nov. 14, 2025

NEO Surveyor, in particular, has garnered immovable bipartisan support in recent years.

From Salon • Jan. 28, 2025

Cheng says he hopes future missions, such as NASA’s NEO Surveyor, set to launch in 2027, may be able to find a larger population of lunar debris still orbiting in our neighborhood.

From Science Magazine • Apr. 19, 2024

All our host Were not so fair a prize for him as I. NEO.

From The Seven Plays in English Verse by Sophocles

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023