decease
Concise Oxford English Dictionary © 2008 Oxford University Press:
decease/dɪˈsiːs/
▶noun formal or Law a person's death. ▶verb archaic die.
– origin ME: from OFr. deces, from L. decessus ‘death’, past part. of decedere ‘to die’.
'decease' also found in these Oxford entries:

