"The world is small."
Translation:La mondo estas malgranda.
This makes me think of an Esperanto saying I came across when first starting to consider learning the language. Something like "La mondo estas sfera" or something like that; essentially meaning that you're never more than half a world away from someone else either geographically or philosophically. Same concept and I wish I could find it again.
World is a common name for the whole of human civilization, specifically human experience, history, or the human condition in general, worldwide.
In a philosophical context it may refer to the whole of the physical universe.
(La vorto mondo signifas la tuton de ekzistaĵoj: la universo, la tero, la homaro aŭ simile.)