decease /dɪˈsiːs/verb 2noun 1forms 4 verb2 •(formal) To cause to die. •(no longer used) To die.After which usurped victorie, he presently deceased: and partly through the excessive joy he thereby conceived. — 1603 noun1 •(formal) Death, departure from life.So should that beauty which you hold in lease Find no determination: then you were Yourself again after yourself's decease […] — 1609 formsdeceased · deceasing · deceases · deceaseth