Abu Dhabi is the capital and the second most populous city of the United ARAB Emirates. It is also the largest of the seven emirates that make up the country. The term 'Emirates' refers to the seven states that make up the UAE, with Abu Dhabi being the largest and most populous. An 'EMIR' is the ruler of an EMIRATE, and Abu Dhabi is ruled by Sheikh Khalifa bin Zayed Al Nahyan. A 'SHEIKDOM' is a monarchy ruled by a sheikh, and Abu Dhabi is a SHEIKDOM. An 'Emirs' is a prince or leader of an EMIRATE, and Abu Dhabi has several emirs. An 'Emeer' is a variant spelling of 'EMIR', and is used to refer to the ruler of an EMIRATE. An 'EMIRATE' is a state ruled by an EMIR, and Abu Dhabi is an EMIRATE. An 'Amir' is another variant spelling of 'EMIR', and is used to refer to the ruler of an EMIRATE. Finally, an 'ARAB' is a member of a Semitic people originating from the Arabian Peninsula, and Abu Dhabi is an ARAB city.