1. a bicycle built for two riders, one behind the other
2. an arrangement of two or more things placed one behind the other

1. one behind the other; together in partnership

1. having two things arranged one behind the other

Examples

• They rode a tandem bicycle through the park.
• The horses were hitched in tandem to pull the wagon.
• The two companies worked in tandem to complete the project.
• The tandem trailer was difficult to back up.
• She learned to drive with tandem wheels for better stability.
• The research teams operated in tandem to gather data.
• The tandem kayak allowed both paddlers to work together.