I suppose their definition of "circle jerk" is top secret too.

Iraq: A Secret Definition - Newsweek Periscope - MSNBC.com:

Sept. 18, 2006 issue - Is Iraq in a civil war? The CIA has developed its own secret guideline for answering that increasingly contentious question. CIA officials offered the definition of "civil war," which remains classified, at a closed-door Capitol Hill briefing to discuss the latest grim Pentagon assessment of the conflict, according to two U.S. officials familiar with the briefing's content who asked for anonymity due to the sensitivity of the material.