liberate

Concise Oxford English Dictionary © 2008 Oxford University Press:
liberate/ˈlɪbəreɪt/

▶verb

• 1 set free, especially from imprisonment or oppression.

  ■ (as adj. liberated) free from social conventions, especially with regard to sexual roles.

• 2 Chemistry & Physics release (gas, energy, etc.) as a result of chemical reaction or physical decomposition.

– derivatives
liberation noun,
liberationist noun,
liberator noun,
liberatory adjective.

– origin C16 (earlier (ME) as liberation): from L. liberat-, liberare ‘to free’, from liber ‘free’.