From aposento (“home”).
Folk etymology suggests that the term's meaning shifted with when Napoleon Bonaparte invaded Portugal and the Portuguese nobles fled to Brazil, claiming for themselves a right to expel someone from their house and move in, subject only to the requiremet that they pay the expellee rent.
aposentadoria f (plural aposentadorias)
- retirement (the act of retiring)
- (uncountable) The state of being retired
- (Brazil) the pension payed to retired people