1. plural of world; planets, especially Earth, or the people living on them
2. different areas of activity, interest, or experience
3. imaginary or fictional universes

Examples

• Scientists search for life on other worlds.
• The collision of two worlds created the moon.
• She moves easily between the worlds of business and art.
• The worlds of politics and entertainment often overlap.
• Fantasy novels create magical worlds full of adventure.
• Video games transport players to different worlds.
• The author built complex worlds in her science fiction series.