Senate - Vine's Expository Dictionary of New Testament Words
Senate
[ 1,,
G1087,
gerousia ]
a council of elders" (from geron, "an old man," a term which early assumed a political sense among the Greeks, the notion of age being merged in that of dignity), is used in
Acts 5:21, apparently epexegetically of the preceding word sunedrion, "council," the Sanhedrin.
Vine's Expository Dictionary of New Testament Words