Cases of word usage

1) (of a legislative assembly) having two separate groups of members e.g. the Senate and the House of Representatives in USA (bicameral)

2) popular music first played by Black groups in the southern USA in the early 20th century, characterized by improvization and strong rhythms (called traditional jazz) (jazz)

3) the elected head of government in the USA and some other republics; a head of some business companies, colleges, societies etc (president)

4) of, from, in, the west part of a country, continent, the world etc; a film, story etc dealing with life in the west part of the USA during the period when Europeans had to settle there (western)