Any of various large international expositions held since the mid 19th century, often called "Expo".

A worldly or sophisticated man, one well versed in the ways and dealings of humankind.

Of or from the Third World.

Those countries aligned with the East during the Cold War, particularly in contrast to those aligned with the West (First World).

(historical, politics) Those countries aligned with the West during the Cold War, particularly in contrast to those aligned with the East (Second World).

(historical, politics) Those countries not aligned with the west or the east during the Cold War. / (sometimes derogatory) The developing countries of Asia, Africa and Latin America.

Tired of the ways of the world; feeling apathetic or cynical due to one's life experiences. / Bored with life.

(obsolete) The Americas. / Europe, the Americas and generally any country whose cultural and ethnic origins can mostly be traced to Europe, collectively.

A war involving the major nations of the world.

(idiomatic) The rest of the world outside of some closed, restricted, or remote environment. / (philosophy) The world external to the human mind.