In the field of law, the system is different between British and American. British have solicitors and barristers, solicitors can not represent their clients in court, but the barristers can. In US, all lawyers are capable in representing their clients in court. So, Attorneys in the United States are in general practice. Attorney General is the title who works for the City, States or Federal Government. Attorny General represents the people of the City, the people of the State, or People of the United States. But, Attorney in private practice is not Attorney General. In short, Attorney General is a government job title. I appealed to the superior court for a traffic citation. The case was John Tse (my real name) vs. People of California. Here, the Attorney General represents the People of California. In English, where the "s" is added to the noun, it is plural, attorney is single, attorneys is plural. Addition: Surgeon general, here, the "general" means general practice (not a specialist). Attorney in private practice is attorney at law, attorney who works for the government, he/she is attorney general.

Attorney General is singular Attorneys General is plural Here "General" is used as an adjective describing the type of Attorney.

From http://en.wikipedia.org/wiki/Attorney_general Some people think the word "general" used in that way entitles the official to the honorific "general", but this is strictly only appropriate for military generals.[1] The word "general" in "attorney general" is an adjective modifying "attorney". The plural of "attorney general" is "attorneys general." The history of the term dates back to Norman England when many of the French legal terms were imported into English common law. In French, the adjective often comes after the noun and so Attorney General meant General Attorney.

Both 'Attorney General' and 'Attorney-General' are okay...

It should be "Attorney-General"