|Compare electrostatic unit EMU, Abbreviation: e.m.u. any unit that belongs to a system of electrical cgs units in which the magnetic constant is given the value of unity and is taken as a pure number|
|a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.|
|a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.|
Any of various units, such as the abampere and the stilb, used in the centimeter-gram-second system of units to describe electric and magnetic field strengths, electric current strengths, and other quantities associated with electromagnetism.