Caliphate (noun)

1. A Muslim empire ruled by a caliph.
2. The Islamic government, community or state headed by a caliph.

Origin:

From arabic khilāfah, from khilāfah succession, from khalafta to succeed.

Examples:

1. The Umayyad Caliphate was the first Muslim empire.
2. The Ottoman Caliphate was the last Islamic empire.
3. The Caliphate was the Islamic government, community or state headed by a caliph.
4. The Caliphate was the political and religious leader of the Islamic state.
5. The Caliphate was the Islamic empire ruled by a caliph.