multitudiˈnosity [f. multitudinous: see -osity.] Multitudinousness. 1840Blackw. Mag. XLVIII. 762 A fiery man..must be goaded into madness..by the multitudinosity of absurdities.1939R. A. Knox Let Dons Delight vi. 161 For all that, sheer multitudinosity has power to oppress the mind.