[ 'kapɪt(ə)l ]
■ noun
1》 (in the US) a building housing a legislative assembly.
↘( the Capitol ) the seat of the US Congress in Washington DC.
2》 ( the Capitol ) the temple of Jupiter on the Capitoline Hill in ancient Rome.
Origin
from OFr. ~ie , capitoile , later assimilated to L. Capitolium (from caput , capit- 'head').