Mapped Diagnostic Context, used in distributed computer systems to distinguish logging information from different sources sent to a single place of storage
MDC-600 and MDC-1200, an AFSK mobile data format used in Motorola two-way radios
Metropolitan District Commission, now part of the Massachusetts Department of Conservation and Recreation, a former agency in the Commonwealth of Massachusetts responsible for roadways and parks in and around the Boston metropolitan area
Metropolitan District Commission, water board serving much of central and north-central Connecticut.
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