Definition from macmillandictionary.com
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We observe changes in the world’s climate.
creatures from alien worlds
We want to guarantee our children a safer world.
The same problems are faced by children throughout the world.
The terrorists pose a threat to the whole world.
She’s won medals at three previous world championships.
the world economy
a world war
It was a choice between the world and God.
She’s gone up in the world, by marrying into money.
If you’re used to driving the newer models, you may feel that you’ve come down in the world.
It is the oldest institution in the English-speaking world.
This disease is increasing dramatically in the western world (=the countries of western Europe and North America).
This library was one of the wonders of the Ancient World.
the entertainment world
the world of work
Children feel powerful in the world of imagination that they create.
I wouldn’t want to bring a child into this cruel world.
Thousands of babies come into the world every day.
There’s something I want to do before I depart this world.