1. a relationship or link between two or more things
2. the act of joining or linking things together
3. a means of communication or transport between places

Examples

• There’s a strong connection between diet and health.
• The connection between the two pipes was loose.
• I missed my connection flight in Chicago.
• Check the internet connection if the page won’t load.
• She got the job through a connection at the company.
• The detective found no connection between the two crimes.
• The train connection to Boston leaves every hour.