Strong’s Greek
G1087 — gerousia
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
γερουσία
gerousia — pronounced gher-oo-see'-ah
from 1088; the eldership, i.e. (collectively) the Jewish Sanhedrin:--senate. see GREEK for 1088
1 occurrence in the KJV.
Acts 5:21
And when they heard that, they entered into the temple early in the morning, and taught. But the high priest came, and they that were with him, and called the council together, and all the senate of the children of Israel, and sent to the prison to have them brought.