(1.)"Jihad" (ǧihād جهاد) is an Arabic word which comes from the Arabic root word "jahada"; which means "exerting utmost effort" or "to strive." The word connotes a wide range of meanings, from an inward spiritual struggle to attain perfect faith to holy war.

(2.) Islamic campaign against nonbelievers: a campaign waged by Muslims in defense of the Islamic faith against people, organizations, or countries regarded as hostile to Islam
Source 1 WordIQ
Source 2 Bing