Real Dictionary

transmission
a stable elementary particle present in all atoms, orbiting the nucleus in numbers equal to the atomic number of the element in the neutral atom; a lepton with a negative charge of 1.602 176 462 × 10–19 coulomb, a rest mass of 9.109 381 88 × 10–31 kilogra
an optical instrument that uses a lens or combination of lenses to produce a magnified image of a small, close object. Modern optical microscopes have magnifications of about 1500 to 2000 [...]
the act or process of transmitting [...]
the branch of mechanics concerned with the forces that change or produce the motions of bodies [...]
the study, design, and manufacture of microscopes [...]
The transmission of something is the passing or sending of it to a different person or place.
countable noun: A transmission is a broadcast.
uncountable noun: The transmission of television or radio programmes is the broadcasting of them.
variable noun: The transmission on a car or other vehicle is the system of gears and shafts by which the power from the engine reaches and turns the wheels.