All 3 Uses

liberate
in
The Hunt for Red October
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Ramius had not yet begun school when he first heard tales from other children about what his father Aleksandr had done in Lithuania in 1940 and after that country's dubious liberation from the Germans in 1944.†
Chpt 3.

liberation = the act of being set free
But Marko wanted to earn whatever he received on his own merits, not to be remembered as an appendage of the "liberator" of Lithuania.†
Chpt 3. *

liberator = someone who sets others free
On his way aft Ryan looked in Borodin's cabin and found the vodka bottle that had been liberated.†
Chpt 15.

liberated = set free

Definitions:

(1) (liberate)
to set free -- as from prison, political oppression, persecution, expectations...
(2) (meaning too rare to warrant focus)
In chemistry liberate can specifically mean to free something (such as a gas) from a compound through chemical reaction. Even more rarely, liberate is used in a humorous way as a synonym for stealing (taking without permission).