Strong’s Greek
G2838 — koimesis
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
κοίμησις
koimesis — pronounced koy'-may-sis
from 2837; sleeping, i.e. (by implication) repose:--taking of rest. see GREEK for 2837
1 occurrence in the KJV.
John 11:13
Howbeit Jesus spake of his death: but they thought that he had spoken of taking of rest in sleep.