Definify.com
Webster 1913 Edition
Decease
De-cease′
,Noun.
 [OE. 
deses
, deces
, F. décès
, fr. L. decessus 
departure, death, fr. decedere 
to depart, die; de- 
+ cedere 
to withdraw. See Cease
, Cede
.] Departure, especially departure from this life; death. 
His 
decease
, which he should accomplish at Jerusalem. Luke ix. 31.
Syn. – Death; departure; dissolution; demise; release. See 
 Death
. De-cease′
,Verb.
 I.
 [
imp. & p. p. 
Deceased
; p. pr. & vb. n. 
Deceasing
.] To depart from this life; to die; to pass away. 
She’s dead, 
deceased
, she's dead. Shakespeare
When our summers have 
deceased
. Tennyson.
Inasmuch as he carries the malignity and the lie with him, he so far 
deceases 
from nature. Emerson.
Webster 1828 Edition
Decease
DECE'ASE
,Noun.
  Definition 2025
decease
decease
English
Noun
decease (uncountable)
- (formal) Death, departure from life.
 
Translations
departure, especially departure from this life; death
Verb
decease (third-person singular simple present deceases, present participle deceasing, simple past and past participle deceased)
-  (now rare) To die.
-  1603, John Florio, translating Michel de Montaigne, Essayes, London: Edward Blount, OCLC 946730821, II.17:
- After which usurped victorie, he presently deceased: and partly through the excessive joy he thereby conceived.
 
 
 -  1603, John Florio, translating Michel de Montaigne, Essayes, London: Edward Blount, OCLC 946730821, II.17:
 
Synonyms
- See also Wikisaurus:die
 
Usage notes
The noun and verb forms are much less commonly used than the participial adjective "deceased", particularly outside formal, literary, or legal usage.