What Does "Freedom" Mean in Islamic Terms?

An an interview with Bernard Lewis, he said:

One has to understand not so much the differences between the [West and the Muslim world] as the differences in the political discourse. In the Western world, we talk all the time about freedom. In the Islamic world, freedom is not a political term. It’s a legal term: Freedom as opposed to slavery. This was a society in which slavery was an accepted institution existing all over the Muslim world. You were free if you were not a slave. It was entirely a legal and social term, with no political connotation whatsoever. You can see in the ongoing debate in Arabic and other languages the puzzlement with which the use of the term freedom was first perceived.

They just didn’t understand it. I mean, what does this have to do with politics or government? Eventually, they got the message. But it’s still alien to them. In Muslim terms, the aim of good government is justice.

The major contrast is not between freedom and tyranny, between freedom and servitude, but between justice and oppression. Or if you like, between justice and injustice. If one follows that particular discourse in the Arab and more generally the Muslim world, it would be more illuminating.