Definition

1. Noun:

   • An arrangement of two or more things or people positioned one directly behind the other: This is the core meaning, describing a linear, single-file arrangement.
   • A bicycle designed for two riders, each with their own set of pedals and usually their own seat: A specific vehicle that embodies the "one behind the other" arrangement.

2. Adverb:

   • One behind the other; in single file: Describes the manner in which people, animals, or things are positioned or moving.

Examples of Usage

• Noun (Arrangement):

  • The skiers moved down the slope in a tight tandem.
  • They purchased a tandem for their weekend rides together.

• Noun (Bicycle):

  • We rented a tandem and cycled along the beach path.
  • Riding a tandem requires good communication and coordination.

• Adverb:

  • The horses were driven tandem.
  • The two systems operate tandem to process the data.

Advanced Usage

• "in tandem": This is the most common adverbial phrase. It means working together, in conjunction, or simultaneously.
  • The two departments are working in tandem on the new project.
  • The engine and electric motor work in tandem to power the hybrid vehicle.

Variants and Related Words

• Tandemly (adverb): A less common variant meaning "in a tandem arrangement or manner."
• Tandem bicycle / Tandem bike: Full terms for the specific vehicle.

Synonyms

• In single file: (For the adverbial sense of arrangement).
• In concert / In cooperation: (For the idiomatic phrase "in tandem" meaning working together).
• Duet bicycle / Bicycle built for two: (For the noun referring to the bicycle).

Related Phrases

• To ride tandem: To ride on a tandem bicycle.
  • They learned to ride tandem last summer.

Related Idioms

• "In tandem with": Functioning or occurring together with something else.
  • The marketing campaign ran in tandem with the product launch.

Adverb

1. one behind the other
   • ride tandem on a bicycle built for two
   • riding horses down the path in tandem

Noun

1. a bicycle with two sets of pedals and two seats
2. an arrangement of two or more objects or persons one behind another