There are 2 main definitions of Mc in English:

Mc1

Syllabification: Mc

abbreviation

Megacycle(s), a unit of frequency equal to one million cycles.

Definition of Mc in:

There are 2 main definitions of Mc in English:

MC2

Syllabification: MC

abbreviation

1Master of Ceremonies.
1.1(In the US) Member of Congress.
1.2(In an astrological chart) the midheaven.
[from Latin Medium Coeli]
1.3(In the UK) Military Cross.

Definition of Mc in: