ENGLISH
REFERENCE

tandem

n. · adv. · adj.
US //ˈtændəm// UK //tˈændəm// tan·dem
  1. 1 a bicycle for two (n.)
    B1 Intermediate

    a bicycle with two seats and two sets of pedals, so two people can ride it together.

    a bicycle designed for two riders, one behind the other, both of whom contribute to the propulsion.

    Example

    The couple spent their Saturday afternoon riding a tandem along the beach path.

    Example

    Riding a tandem requires significant coordination between the lead cyclist and the stoker behind to maintain balance and pace.
    • tandem bicycle
  2. 2 a partnership (n.)
    B2 Upper Intermediate

    two people or things that work very closely together to achieve something.

    a group of two people or machines functioning together in close collaboration.

    Example

    The two detectives worked as a tandem to solve the difficult case.

    Example

    The creative tandem of the writer and the illustrator has produced some of the most iconic graphic novels of the decade.
  3. 3 language learning (n.)
    B2 Upper Intermediate Education

    a way to learn a language by talking with a native speaker who wants to learn your language.

    a method of language acquisition based on mutual exchange between native speakers of different languages.

    Example

    I found a great tandem partner to help me practice my Spanish conversation skills.

    Example

    The university's tandem programme pairs international students with locals to foster linguistic fluency and cultural exchange.
    • language exchange
  4. 4 in tandem (adv.)
    B2 Upper Intermediate

    doing something at the same time or working together with someone else.

    acting in conjunction or simultaneously; often used in the fixed phrase 'in tandem'.

    Example

    The two companies worked in tandem to finish the project on time.

    Example

    The fiscal reforms must operate in tandem with monetary policy to effectively curb the rising inflation rates.
  5. 5 arranged one behind the other (adj.)
    C1 Advanced Technical

    having two parts where one is placed behind the other.

    consisting of two components or animals arranged in a single line, one behind the other.

    Example

    The truck had tandem axles to help it carry the heavy load safely.

    Example

    The engineer specified a tandem seating arrangement for the cockpit to minimize the aircraft's frontal surface area.
  6. 6 medical device (n.)
    C2 Proficiency Technical Medicine

    a small tube used in hospitals to treat certain types of cancer.

    a hollow metal tube used to hold radioactive material during internal radiation therapy for gynecological cancers.

    Example

    The doctor explained how the tandem would be used during the radiation treatment.

    Example

    The precise placement of the tandem and ovoids is critical for delivering the correct dose of radiation to the tumour site.

Origin

PIE word *téh₂m The noun is borrowed from Latin tandem (“of time: at last, at length, finally”), applied humorously in English to two horses harnessed “at length” (that is, in a single line) instead of side-by-side. Tandem is derived from tam (“so, to such an extent”) + -dem (demonstrative suffix). The adjective, adverb, and verb are derived from the noun.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

Related words

Last updated June 20, 2026