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.

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

Of, or relating to the ancient world or former times

The Eastern Hemisphere, especially Europe, Africa and Asia. / The known world before the discovery of the Americas.

An event or competition where competitors and/or teams from several different countries to establish a world champion. / The trophy awarded to the winner of such an event.

The realm of human experience comprising physical objects, and excluding theoretical constructs, hypotheses, artificial environments, and "virtual" worlds such as the Internet, computer simulations, or the imagination.

Alternative form of real-world

(programming, by extension) A simple first program for any purpose.

(programming) A simple script or program designed to output the text "Hello World" as a demonstration of the computer language or environment.