Terrorism has both a commonly understood meaning and a legal meaning. Before beginning your research understand how various terms are used.
How will your choice of terms affect your search? Do you need to use a more specific term (domestic terrorism, ecoterrorism, cyberterrorism). Many databases will provide a thesaurus of terms, laying out how terrorism and related terminology are used in that resources. Look for this thesaurus in any database you use. The brief video below walks you through locating the definition of terrorism in one database (The Index to Legal Periodicals).
Looking for data? How will these definitions affect the data you are using? Check data definitions to be sure it is measuring what you think it is measuring. Look in code books and user manuals for this information.
Researching at an organization's website? Try to determine how they are defining terrorism. How do the law enforcement and national security agencies or international organizations define terrorism? Some organizations, such as the U.N. have no agreed upon definition of terrorism.
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The guides below explore different aspects of topics related to terrorism.