ENGLISH
REFERENCE

fifteen

num. · n.
US //ˈfɪfˈtin// UK //fɪftˈiːn// fif·teen
  1. 1 the number 15 (num.)
    A1 Beginner

    the number 15.

    the cardinal number following fourteen and preceding sixteen.

    Example

    There are fifteen students in my English class this morning.

    Example

    The research team spent fifteen months collecting data across three different continents before publishing their final report.

  2. 2 a group of fifteen (n.)
    B2 Upper Intermediate Sport

    a group or set of fifteen people or things.

    a set or group containing fifteen units, often used in the context of sports teams like rugby union.

    Example

    The local fifteen played a great game of rugby on Saturday.

    Example

    The national fifteen took to the field under heavy rain, determined to defend their title against the visiting side.

Show 1 more senseShow fewer
  1. 3 Irish traybake dessert (n.)
    C1 Advanced British English Dialect Cooking

    a sweet snack from Ireland made with biscuits, marshmallows, and cherries.

    a traditional Northern Irish traybake consisting of crushed biscuits, marshmallows, and glacé cherries bound with condensed milk.

    Example

    We had tea and a couple of sweet fifteens at the café in Belfast.

    Example

    The bakery is famous for its traditional fifteens, which are prepared daily using a family recipe that has remained unchanged for decades.

    Usage

    Usually used in the plural form 'fifteens' when referring to the individual pieces of the traybake.

Origin

PIE word *pénkʷe From Middle English fiftene, from Old English fīftīene, fīftēne, from Proto-Germanic *fimftehun. Cognate with West Frisian fyftjin, Dutch vijftien, German fünfzehn, Danish femten. Equivalent to five + -teen.

Word family

© 2026 English Reference