Jihad.
Usage of the term
Jihad literally means to "struggle", notably to "struggle in the way of God" or "to struggle to improve one's self and/or society. [1] It is sometimes referred to as the sixth pillar of Islam, although it occupies no official status as such. Within Islamic jurisprudence, jihad is usually taken to mean military exertion against non-Muslim combatants but there are other ways to perform jihad as well.[2][3] In broader usage and interpretation, the term has accrued both violent and non-violent meanings. It can imply striving to live a moral and virtuous life, spreading and defending Islam, and fighting injustice and oppression, among other things.[4] In the languages of non-islamic cultures, the term is usually used to refer to Muslim 'Holy War' or any violent strife invoking Allah.
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http://en.wikipedia.org/wiki/Jihad(sorry hyperlink thingy was fuckin up)