Legatum Optionis
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
In Roman law. A legacy to A. B. of any article or articles that A. B. liked to choose or select out of the testator's estate. If A. B. died after the testator, but before making the choice or selection, his representative (hœres) could not, prior to Justinian, make the selection for him, but the legacy failed altogether. Justinian, however, made the legacy good, and enabled the representative to choose.
Brown.