Strong’s Greek
G51 — agnoema
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
ἀγνόημα
agnoema — pronounced ag-no'-ay-mah
from 50; a thing ignored, i.e. shortcoming:--error. see GREEK for 50
1 occurrence in the KJV.
Hebrews 9:7
But into the second went the high priest alone once every year, not without blood, which he offered for himself, and for the errors of the people: