1) Along with the courts, the main governing body of the
Galactic Republic that
Supreme Chancellor Sheev Palpatine of Naboo embodies.
2) An government entity possessing the unlimited power.
3) A man too dangerous to be left alive.
"
I am the Senate." -
Palpatine, the Senate
"Not yet." - Mace Windu, blinded by arrogance
"It's treason, then." - Palpatine, readying himself to do a
920 degree backflip spin from the prone position to stab three worthless Jedi masters while screeching