noun

• Message sequence chart, an interaction diagram.
• Abbreviation of Master of Science. [A degree that usually requires 2-3 years beyond a Bachelor of Science and emphasizes science and scientific applications. The degree is less advanced than a Doctorate degree.]
• (medicine) Initialism of Mesenchymal stem cell.
• (aviation, travel) Initialism of Most Significant Carrier, a method used by some airlines to determine the baggage allowance of a multi-carrier air ticket.
• (military, US) Initialism of Military Sealift Command: an organization that controls the replenishment and military transport ships of the United States Navy.
• Initialism of Manned Spacecraft Center.
• (business, finance) Initialism of Melbourne Securities Corporation.
• Initialism of Modern Standard Chinese.
• (geology) Initialism of Messinian salinity crisis. [(geology) A geological event, characterised by the partial desiccation of the Mediterranean basin, which occurred throughout the latter part of the Messinian age of the Miocene epoch, from 5.96 to 5.33 million years ago, and finally ended with the Zanclean flood.]