Princeton's WordNet

1. terrorism, act of terrorism, terrorist act(noun)

   the calculated use of violence (or the threat of violence) against civilians in order to attain goals that are political or religious or ideological in nature; this is done through intimidation or coercion or instilling fear

Kernerman English Learner's Dictionary

1. terrorism(noun)ˈtɛr əˌrɪz əm

   the use of violence to try to achieve political change

   the fight against terrorism

Wiktionary

1. terrorism(Noun)

   The deliberate commission of an act of violence to create an emotional response through the suffering of the victims in the furtherance of a political or social agenda.

2. terrorism(Noun)

   Violence against civilians to achieve military or political objectives.

3. terrorism(Noun)

   A psychological strategy of war for gaining political or religious ends by deliberately creating a climate of fear among the population of a state.

Webster Dictionary

1. Terrorism(noun)

   the act of terrorizing, or state of being terrorized; a mode of government by terror or intimidation

2. Terrorism(noun)

   the practise of coercing governments to accede to political demands by committing violence on civilian targets; any similar use of violence to achieve goals

U.S. National Library of Medicine

1. Terrorism

   The use or threatened use of force or violence against persons or property in violation of criminal laws for purposes of intimidation, coercion, or ransom, in support of political or social objectives.

Dictionary of Military and Associated Terms

1. terrorism

   The calculated use of unlawful violence or threat of unlawful violence to inculcate fear; intended to coerce or to intimidate governments or societies in the pursuit of goals that are generally political, religious, or ideological. See also antiterrorism; combating terrorism; counterterrorism; force protection condition; terrorist; terrorist group.

• terrorismeAfrikaans
• إرْهابArabic
• тероризъмBulgarian
• terrorismoPortuguese (BR)
• terorismusCzech
• der TerrorismusGerman
• terrorismeDanish
• τρομοκρατίαGreek
• terrorismoSpanish
• terrorismEstonian
• تروریسمFarsi
• terrorismiFinnish
• terrorismeFrench
• טְרוֹרִיזְםHebrew
• आतंकवादHindi
• terorizamCroatian
• terrorizmusHungarian
• terorismeIndonesian
• hryðjuverkastarfsemiIcelandic
• terrorismoItalian
• テロ行為Japanese
• 테러리즘Korean
• terorizmasLithuanian
• terorismsLatvian
• keganasanMalay
• terrorismeDutch
• terrorismeNorwegian
• terroryzmPolish
• تروریسمPersian
• ډار اچونه، دزور او دهشت دلارې خلك اطاعت ته مجبورول، ټرو ريزم، دترورمسلكPashto
• terrorismoPortuguese
• terorismRomanian
• терроризмRussian
• násilie, terorizmusSlovak
• terorizemSlovenian
• terorizamSerbian
• terrorismSwedish
• การใช้ความรุนแรงเพื่อข้อเรียกร้องทางการเมือง; การก่อการร้ายThai
• terörizm, tedhişçilikTurkish
• 恐怖行為(主義)Chinese (Trad.)
• тероризмUkrainian
• دہشت گرديUrdu
• chủ nghĩa khủng bốVietnamese
• 恐怖行为（主义）Chinese (Simp.)