grant freedom to; as from slavery or servitude; "Slaves were enfranchised in the mid-19th century"
{f} give a person certain rights (especially the right to vote); liberate, emancipate, free
To endow with a franchise; to incorporate into a body politic and thus to invest with civil and political privileges; to admit to the privileges of a freeman
To enfranchise someone means to give them the right to vote in elections. The company voted to enfranchise its 120 women members. to give a group of people the right to vote disenfranchise