surplus   
amby
excess, surplus, the thing over. It is much used in counting, as, roa amby ny folo, two in excess of ten, hence twelve. In the provinces we have folo roa amby, and so with all the other numbers. It was also used formerly in repeating numbers in the ceremony of circumcision, as, isa amby roa, one and two; roa amby roa, two and two. [Richardson 1885]
excess, surplus [Hallanger 1973]
excédent, surplus [Hallanger 1974]
tombo
an increase, a profit, a surplus [Hallanger 1973]
augmentation, croissance; bénéfice; surplus [Hallanger 1974]

surplus   
ambim-bava
surplus [SLP: Voambolana]
amby
excédent, surplus [Hallanger 1974]
bambo
surplus d'un partage, partagé ensuite. [David 1952]
fañampe
Accessoire, addition, excédent, supplément, surplus [Poirot & Santio: Vezo]
mahatovona
qui peut ajouter, augmenter, qui suffit pour l'ajout, pour le surplus [Abinal 1888]
tombo
augmentation, croissance; bénéfice; surplus [Hallanger 1974]