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Terrorism is, in the broadest sense, the use of intentional violence for political or religious purposes.[1] It is used in this regard primarily to refer to violence during peacetime or in the context of war against non-combatants (mostly civilians and neutral military personnel).[2] The terms "terrorist" and "terrorism" originated during the French Revolution of the late 18th century[3] but gained mainstream popularity in the 1970s during the conflicts of 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 City and Washington, D.C. in 2001.

There are various different definitions of terrorism, with no universal agreement about it.[4][5] Terrorism is a charged term. It is often used with the connotation of something that is "morally wrong". Governments and non-state groups use the term to abuse or denounce opposing groups.[5][6][7][8][9] Varied political organizations have been accused of using terrorism to achieve their objectives. These include right-wing and left-wing political organizations, nationalist groups, religious groups, revolutionaries and ruling governments.[10]
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There are over 109 different definitions of terrorism.[32] American political philosopher Michael Walzer in 2002 wrote: "Terrorism is the deliberate killing of innocent people, at random, to spread fear through a whole population and force the hand of its political leaders".[5] Bruce Hoffman, an American scholar, has noted that it is not only individual agencies within the same governmental apparatus that cannot agree on a single definition of terrorism. Experts and other long-established scholars in the field are equally incapable of reaching a consensus.[33]

https://en.wikipedia.org/wiki/Terrorism [wikipedia.org]

Which version are you using? I would dare say that Michael Walzer's 2002 definition is the one that most people associate with the word "Terrorism".