Chain (noun)

1. A series of links or rings, typically of metal, used for fastening or securing things.
2. A series of interconnected things or events that form a complex whole.

Origin:

Old english cægen, of germanic origin; related to dutch keten and german kette.

Examples:

1. She wore a gold chain around her neck.
2. He attached the bicycle to the lamp post with a chain.
3. The store is part of a chain of supermarkets.
4. The company is the largest in a chain of companies.
5. The series of events that led to the accident was like a chain reaction.