umbarta- vb. “to define, decree, destine”; this form of the verb was used “in more lofty senses”, otherwise marta- (PE17:104)
Umbarto masc. name, "Fated", mother-name (never used in narrative) of Telufinwë = Amras. The ominous name was altered to Ambarto by Fëanor. (PM:353-354)