English Reference
noun

terror

n.
US /ˈtɛɹɝ/ UK /tˈɛɹɐ/ ter·ror UK spelling terror's, terror's

  1. 01 B2 Upper Intermediate

    a feeling of very strong fear or dread.

    a state of intense, overwhelming fear or dread. Uncountable in its abstract sense.

    Simple

    The passengers watched in terror as the engine began to smoke.

    In context

    A look of pure terror crossed his face when he realised the safety harness had not been properly secured before the climb.

  2. 02 B2 Upper Intermediate Politics

    the use of violence and threats to scare people for political reasons.

    the systematic use of violence and intimidation, especially against civilians, to achieve political or ideological goals.

    Simple

    The government promised to fight against international terror.

    In context

    The global campaign against terror has led to significant changes in international security protocols and border control measures.

  3. 03 C1 Advanced Informal

    a person, especially a child, who is very difficult to manage or causes a lot of trouble.

    a person or thing that causes extreme annoyance or difficulty; frequently applied to unruly children.

    Simple

    Their youngest son is a little terror when he doesn't get his way.

    In context

    The new puppy proved to be a complete terror, chewing through several expensive cables within his first week in the house.

  4. 04 C1 Advanced Formal History

    a famous period of extreme violence during the French Revolution.

    a period of the French Revolution characterised by mass executions and state-sanctioned violence. Usually capitalised as 'the Terror'.

    Simple

    We studied the Terror and the fall of Robespierre in our history class.

    In context

    Historians often debate the specific socio-political factors that allowed the Terror to escalate so rapidly in eighteenth-century France.

Usage terror attack · terror attacks

And Gaza can never again be a source of terror for Israel,” the source added.

Al Jazeera· 16 Aug 2026

We are living in a state of terror,” Hassan said.

The Guardian· 13 Aug 2026

Etymology tree Proto-Indo-European *tres- Proto-Indo-European *-yeti Proto-Indo-European *-éyeti Proto-Indo-European *troséyeti Proto-Italic *trozeō Latin terreō Proto-Indo-European *-os Proto-Indo-European *-s Proto-Indo-European *-ōs Proto-Italic *-ōs Latin -or Latin terrorbor. Old French terreur Middle French terreurbor. Middle English terrour English terror From late Middle English terrour, from Old French terreur f (“terror, fear, dread”), from Latin terror m (“fright, fear, terror”), from terrēre (“to frighten, terrify”), from Old Latin tr̥reō, from Proto-Italic trozeō, from Proto-Indo-European tre- (“to shake”), *tres- (“to tremble”).

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Origin ine-pro *tre-
Level B2 · Upper Intermediate
Frequency Common
Updated