What does "emancipation" mean?

Emancipation: The act of setting free from the power of another, from slavery, subjection, dependence, or controlling influence; also, the state of being thus set free; liberation; as, the emancipation of slaves; the emancipation of minors; the emancipation of a person from prejudices; the emancipation of the mind from superstition; the emancipation of a nation from tyranny or subjection.