Congressman (noun)

1. A male member of a congress, especially the US Congress.
2. A representative in a legislative assembly.
3. A politician who holds a seat in a legislative assembly.

Origin:

Derived from the latin word 'congressus' meaning 'a meeting'.

Examples:

1. The congressman is a well-known advocate for environmental protection.
2. The congressman's speech was well received by the audience.
3. The congressman has been representing his constituents for many years.