United Airlines Flight 175 hits the South Tower of the World Trade Center during the September 11 attacks of 2001 in New York City.

Terrorism is, in the broadest sense, the use of intentionally indiscriminate violence as a means to create terror among masses of people; or fear to achieve a religious or political aim.[1] It is used in this regard primarily to refer to violence during peacetime or in war against non-combatants.[2] The terms "terrorist" and "terrorism" originated during the French Revolution of the late 18th century[3] but gained mainstream popularity in the 1970s in news reports and books covering the conflicts in Northern Ireland, the Basque Country and Palestine. The increased use of suicide attacks from the 1980s onwards was typified by the September 11 attacks in New York and at the Pentagon in 2001.

There is no commonly accepted definition of "terrorism".[4][5] Being a charged term, with the connotation of something "morally wrong", it is often used, both by governments and non-state groups, to abuse or denounce opposing groups.[6][7][8][9][5] Broad categories of political organisations have been claimed to have been involved in terrorism to further their objectives, including right-wing and left-wing political organisations, nationalist groups, religious groups, revolutionaries and ruling governments.[10] Terrorism-related legislation has been adopted in various states, regarding "terrorism" as a crime.[11][12] There is no universal agreement as to whether or not "terrorism", in some definition, should be regarded as a war crime.[12][13]

According to the Global Terrorism Database maintained by the University of Maryland, College Park, more than 61,000 incidents of non-state terrorism, resulting in at least 140,000 deaths, were recorded between 2000 and 2014.[14]


Etmologically, the word terror is derived from the Latin verb Tersere, which later becomes Terrere. The latter form appears in European languages as early as the 12th century; its first known use in French is the word terrible in 1160. By 1356 the word terreur is in use. Terreur is the origin of the Middle English term terrour, which later becomes the modern word "terror".[15]

Other Languages
Afrikaans: Terrorisme
Alemannisch: Terrorismus
العربية: إرهاب
aragonés: Terrorismo
asturianu: Terrorismu
azərbaycanca: Terrorizm
تۆرکجه: تروریزم
Bân-lâm-gú: Khióng-pò͘-chú-gī
башҡортса: Терроризм
беларуская: Тэрарызм
беларуская (тарашкевіца)‎: Тэрарызм
български: Тероризъм
bosanski: Terorizam
brezhoneg: Sponterezh
буряад: Терроризм
català: Terrorisme
Cebuano: Terorismo
čeština: Terorismus
Cymraeg: Terfysgaeth
dansk: Terrorisme
Deutsch: Terrorismus
eesti: Terrorism
Ελληνικά: Τρομοκρατία
español: Terrorismo
Esperanto: Terorismo
euskara: Terrorismo
فارسی: تروریسم
Fiji Hindi: Atankwaad
føroyskt: Yvirgangur
français: Terrorisme
galego: Terrorismo
ગુજરાતી: આતંકવાદ
한국어: 테러리즘
हिन्दी: आतंकवाद
hrvatski: Terorizam
Ilokano: Terorismo
Bahasa Indonesia: Terorisme
interlingua: Terrorismo
íslenska: Hryðjuverk
italiano: Terrorismo
עברית: טרור
Basa Jawa: Terorisme
къарачай-малкъар: Терроризм
ქართული: ტერორიზმი
қазақша: Терроризм
Kinyarwanda: Iterabwoba
Kiswahili: Ugaidi
kurdî: Terorîzm
Кыргызча: Терроризм
Ladino: Terrorizmo
Latina: Tromocratia
latviešu: Terorisms
lietuvių: Terorizmas
Limburgs: Terrorisme
la .lojban.: tadjycolnunte'a
lumbaart: Terrorism
magyar: Terrorizmus
македонски: Тероризам
മലയാളം: ഭീകരവാദം
मराठी: दहशतवाद
მარგალური: ტერორიზმი
مازِرونی: تروریسم
Bahasa Melayu: Terorisme
Nederlands: Terrorisme
Nedersaksies: Terrorisme
नेपाल भाषा: आतङ्कवाद
日本語: テロリズム
norsk: Terrorisme
norsk nynorsk: Terrorisme
occitan: Terrorisme
oʻzbekcha/ўзбекча: Terrorizm
ਪੰਜਾਬੀ: ਦਹਿਸ਼ਤਵਾਦ
پنجابی: دہشت گردی
Piemontèis: Terorism
Plattdüütsch: Terrorismus
polski: Terroryzm
português: Terrorismo
română: Terorism
русиньскый: Терорізм
русский: Терроризм
саха тыла: Терроризм
Scots: Terrorism
shqip: Terrorizmi
sicilianu: Tirrurìsimu
Simple English: Terrorism
slovenčina: Terorizmus
slovenščina: Terorizem
کوردی: تیرۆریزم
српски / srpski: Тероризам
srpskohrvatski / српскохрватски: Terorizam
suomi: Terrorismi
svenska: Terrorism
Tagalog: Terorismo
татарча/tatarça: Террорчылык
తెలుగు: ఉగ్రవాదం
тоҷикӣ: Терроризм
Türkçe: Terörizm
українська: Тероризм
Tiếng Việt: Khủng bố
walon: Terorisse
Winaray: Terorismo
吴语: 恐怖主义
ייִדיש: טעראריזם
粵語: 恐怖主義
Zazaki: Terorizm
žemaitėška: Teruorėzmos
中文: 恐怖主义