Dictionary.com
Thesaurus.com

counterterrorism

American  
[koun-ter-ter-uh-riz-uhm] / ˌkaʊn tərˈtɛr əˌrɪz əm /

noun

  1. terrorism in reaction to or retaliation for some previous act of terrorism.


counterterrorism British  
/ ˌkaʊntəˈtɛrəˌrɪzəm /

noun

  1. activities that are intended to prevent terrorist acts or to eradicate terrorist groups

"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

Other Word Forms

Etymology

Origin of counterterrorism

First recorded in 1965–70; counter- + terrorism

Explanation

Governments use counterterrorism to fight back against violence that threatens civilians. Counterterrorism ranges from military campaigns to policing websites for hate speech. The term counterterrorism adds counter-, or "against," to terrorism, which derives from a Latin root meaning "to tremble." Protecting civilians from violence, or fighting back against groups that have committed terrorist acts, is what counterterrorism aims to do. Police and military forces often have units dedicated to this, and governments enact counterterrorism measures that include airport security, tightening control of finances, and streamlining communication between different countries.

Keep Reading on Vocabulary.com

Vocabulary lists containing counterterrorism

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.

See Examples For:

Cait Conley, an Army veteran who ran counterterrorism in the Biden administration, will face Rep. Mike Lawler, a vulnerable Republican, in New York’s Hudson Valley.

From Slate Jun. 24, 2026

Pakistan found a way to cooperate with the U.S. on counterterrorism and promised Americans access to critical minerals.

From The Wall Street Journal Jun. 17, 2026

The program allows US intelligence agencies to collect communications of foreign targets overseas without a warrant, and officials say it is central to counterterrorism and other national security work.

From Barron's Jun. 11, 2026

Erroll Southers has faced criticism for an increase in police shootings during his tenure on the commission, and for his past counterterrorism studies in Israel.

From Los Angeles Times Jun. 6, 2026

It was closely followed by a chase car with two agents from the DGSI, the French intelligence agency in charge of counterterrorism.

From "City Spies" by James Ponti

Vocabulary.com logo
by dictionary.com

Dictionary.com's Learning Companion

Go beyond just looking up words.
Remember them forever with VocabTrainer.

Start training