What does AD DEF AN stand for?

Ad Defectionem Animi (to the point of fainting; Latin: in consequence of a defect of the mind)

This definition appears very rarely and is found in the following Acronym Finder categories:

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Awaiting Disconnection Awdal (postal region, Somalia) Azumanga Daioh (anime) Azure Dreams (role-playing game) Destroyer Tender (US Navy ship designation) Partia Aleanca Demokratike (Party of the Democratic Alliance, Albania, aka: PADSh) priority add-on (US DoD) Right Ear Ad Duas Vices (Latin: In Two Doses) BT telephone system in Equipment Room		Ad Deliquium (to the point of fainting; Latin: in consequence of a defect) Active Directory Domain Services (windows programming) Advocates in Defense of Expression in the Media (Canada) Ad Libitur (Latin: As Desired) Ad Libitum (Latin: Freely) Ad Locum - At the Place Ad Pondus Omnium (Latin: considering the weight of all things) Ad Saturatum (Latin: to saturation) Ad Valorem - According to the Value Acquisition, Development and Construction (housing industry)