1. the action of becoming larger or more extensive
2. things that have been added to make something larger or more complete
3. detailed explanations or developments of ideas or topics

Examples

• The company announced several expansions into new markets.
• The museum’s recent expansions include a modern art wing.
• Economic expansions typically lead to increased employment.
• The book’s second edition includes expansions of the original chapters.
• Urban expansions have affected wildlife habitats.
• The software update includes expansions to existing features.
• Population expansions put pressure on natural resources.