What does DOS stand for?

Date of Service (health insurance)

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

Science, medicine, engineering, etc.
Business, finance, etc.

Other Resources:

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Decomposition de l'Operateur de Retournement Temporel Diorite (lithological term) Department of Road Transport and Highways (India) Department of Rapid Transit Systems (Taipei, Taiwan) Double Outlet Right Ventricle Dad Over Shoulder Daemons of Shadow (gaming) Data Overhead Switch (Nortel) Date of Seeding Date Of Separation		Date of Sobriety (recovery programs) Daughter of Satan Day of Show Days of Supply (US DoD) Dead on Scene Dean of Students Declaration of Security Degree of Saturation Degree of Superiority (algorithm comparison) Democratic Opposition of Serbia

Samples in periodicals archive:

An important issue arose as to the precise date of service by email of a Payment Claim, and noting the Electronic Transaction Act 2000 (NSW).

Service Of Notices By Email Under The Building And Construction ...

It wasn't a violation of the enlistment contract, but I believe that when somebody's end date of service comes up, to hold them against their will, if you will, is just not the right thing to do.

US Army will end extended tours for soldiers: Gates

496 16-0 Requirement in (b) for service of objection to a claim "in the manner provided for service of formal notice" deleted and replaced by requirement for certificate or other proof of service, which establishes date of service.

Amendments to the probate rules