προαιρετικός (bn):
vrijwillig(de) aus freiem Willen, ohne explizite Aufforderung.
(en) done, given, or acting of one's own free will.
(pl) —., alternatief(en) relating to a choice., optioneel(en) not compulsory.
cached Via: Dbnary en WikiWoordenboeken
Via: Memodata.com