MC can stand for different things depending on the context. Here are some of the most common meanings:

• Master of Ceremonies: This is a person who acts as the official host of a ceremony, event, conference, or performance. The abbreviation for Master of Ceremonies is MC or emcee.

• Medical Corps: This is a branch of the military responsible for providing medical care to service members and their families.

• Member of Congress: This refers to a person who has been elected to serve in the United States Congress.

• Megacycle: This is a unit of frequency in the microwave band.

• Millicurie: This is a unit of measurement for the amount of radioactivity in a sample.

• Minecraft: This is a popular sandbox video game made by Mojang).

• Music Canada: This is a non-profit trade organization for companies that record, manufacture, produce, and distribute music in Canada).

• Music Choice: This is a cable television channel that plays music videos).

In general, MC is often used as an abbreviation for "Master of Ceremonies" or "emcee" in the context of events, conferences, and performances.