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AGN

American

abbreviation

Astronomy. active galactic nucleus.

AGN British

abbreviation

active galactic nucleus See active galaxy

"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

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.

Dutch insurer and asset manager Aegon AGN -7.64%decrease; red down pointing triangle plans to relocate its business to the U.S. and rebrand as Transamerica Inc., a move aimed at accelerating growth in the region.

From The Wall Street Journal • Dec. 10, 2025

"The AGN has endorsed Ethiopia," Richard Muyungi, the group's chair told AFP.

From Barron's • Nov. 11, 2025

The most likely explanation for this rapid brightening is a black hole with a mass 1 million times that of our Sun switching on an AGN at the heart of SDSS1335+0728, the team concludes.

From Science Magazine • Jun. 17, 2024

As matter whirls into the black hole, it generates radiation across the entire electromagnetic spectrum, making the AGN shine brightly.

From Science Daily • May 6, 2024

But quasars are an AGN that are even more intense.

From Salon • Apr. 30, 2023

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