/ˈtɛrər/
[noun] An extreme feeling of fear or something that causes great fear. Terror is stronger than ordinary fear — it is the kind that makes a person freeze or lose control completely.
The word 'terror' comes from a Latin root meaning 'to tremble' — so every terrorist literally makes the world shake.
The story of 'terror' begins in ancient Rome, with the Latin noun *terror*, meaning intense fear or dread. This came from the Latin verb *terrere*, meaning 'to frighten' or 'to cause to tremble,' which itself is thought to connect to a Proto-Indo-European root *tres-*, meaning 'to tremble.' The physical image is vivid and bodily — this was not abstract anxiety, but the kind of fear that shakes the flesh. Roman writers used *terror* to describe the panic that seized armies on a battlefield, the dread inspired by omens, or the overwhelming power of the gods.
From Latin, the word passed into Old French as *terreur*, carrying the same core meaning of extreme, paralyzing fear. Old French was the dominant literary and legal language of England after the Norman Conquest of 1066, and it acted as a great channel through which hundreds of Latin-rooted words flowed into English. By the late 14th century, Middle English had absorbed *terreur* and reshaped it into *terrour*, and eventually into the modern form *terror*. Early English uses of the word kept its classical force — it described overwhelming, almost supernatural dread.
For several centuries, 'terror' remained a word of strong but general meaning. Writers used it to capture the feeling of standing before something vast and uncontrollable — a storm at sea, a fearsome ruler, divine punishment. In the 17th and 18th centuries, literary thinkers began to explore 'terror' as an aesthetic experience, debating what made certain paintings, landscapes, or poems produce that delicious, shuddering fear in the reader or viewer. Edmund Burke's influential 1757 essay *A Philosophical Enquiry* argued that terror was actually the foundation of the 'sublime' — the idea that what frightens us most is also what we find most powerful and magnificent.
The word took on a sharp political edge during the French Revolution, when the period from 1793 to 1794 became known as *la Terreur* — the Reign of Terror. The revolutionary government, led by Robespierre, used mass executions as a tool of political control, and suddenly 'terror' was no longer just an inner feeling but a system of organised violence. This historical moment permanently changed how English speakers understood the word, adding a sense of deliberate, politically motivated cruelty that had not been so prominent before.
From that political meaning grew the modern family of related words. *Terrorism*, first recorded in English in the early 19th century, described the use of terror as a weapon of control or coercion. *Terrorist* followed quickly. The Latin root *terrere* also gave English *terrible* (through Latin *terribilis* → Old French *terrible* → English *terrible*), *terrific* (originally meaning 'causing terror,' only later softened to mean 'very good'), and *terrify* (Latin *terrificare* → English *terrify*). It is a small irony of language history that 'terrific,' born from the same root as terror, now means something wonderful rather than something frightening.