de Sade de·sade uncommon noun 1. French soldier and writer whose descriptions of sexual perversion gave rise to the term `sadism'' (1740-1814) SynonymsSadede SadeComte Donatien Alphonse Francois de SadeMarquis de Sade Related words Broader terms writer WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.