heir presumptive

Etymology
A, hence the unusual order of adjective following noun.

Noun

 * 1) Someone who will become an heir (usually to a monarchy) only if no-one with a higher-ranking claim is born.

Antonyms

 * heir apparent

Translations

 * Chinese:
 * Mandarin: 假定繼承人
 * Danish:
 * Dutch:
 * Finnish:
 * French:
 * Greek: επίδοξος κληρονόμος, πιθανός κληρονόμος
 * Irish: tánaiste
 * Italian: erede presuntivo, erede presuntiva
 * Spanish: heredero presunto, heredera presunta
 * Ukrainian:
 * Welsh: etifedd tebygol