English Reference
adjective · noun · verb

serial

adj. · n. · v.
US /ˈsɪˌɹiəɫ/ UK /sˈiəɹɪəl/ se·ri·al UK spelling serials

  1. 01 B2 Upper Intermediate Academic

    adj.happening in a specific order or series.

    adj.arranged in or consisting of a series; following a chronological or logical sequence.

    Simple

    The computer processes the data in serial order, one piece after another.

    In context

    The processor handles instructions in a serial fashion, ensuring that each task is completed before the subsequent operation begins.

    Usage

    Often used in technical or academic contexts to contrast with 'parallel'.

  2. 02 B2 Upper Intermediate

    adj.doing the same thing many times, often used for crimes or bad habits.

    adj.performing a specified action or course of action repeatedly or regularly over a period of time.

    Simple

    The police finally caught the serial thief who had been robbing houses for months.

    In context

    Psychologists studied the serial offender to understand the behavioral patterns that led to such frequent recidivism.

    one offoccasional
  3. 03 B2 Upper Intermediate

    adj.published or shown in several parts over a period of time.

    adj.published, broadcast, or produced in successive installments.

    Simple

    The magazine is publishing a serial story that continues every month.

    In context

    The author gained fame through the serial publication of his novels in Victorian literary journals.

  4. 04 B2 Upper Intermediate

    n.a story, radio show, or TV programme that is told in many separate parts.

    n.a literary or dramatic work published or broadcast in regular installments.

    Simple

    I missed the last part of the serial, so I don't know how the story ended.

    In context

    The television serial captivated the nation for ten weeks, culminating in a finale that broke all previous viewing records.

  5. 05 C1 Advanced SlangInformal Computing

    n.a code or number you need to make a computer program work.

    n.a serial number, specifically a unique alphanumeric string required to activate or register software.

    Simple

    I lost the serial for my photo editing software and couldn't reinstall it.

    In context

    The user was unable to bypass the activation screen because the serial provided in the documentation was invalid.

    license keyproduct key
  6. 06 C1 Advanced TechnicalFormal

    v.to give a unique number to something in a series.

    v.to assign a serial number to an item, typically for tracking or identification purposes.

    Simple

    The factory serials every engine before it is shipped to the customer.

    In context

    The aviation authority requires manufacturers to serial every critical component to ensure traceability in the event of mechanical failure.

The British writer is known for his unique ability to get inside the heads of serial killers.

The Guardian· 15 Aug 2026

Phillips played a key role in pioneering these scripted serials, with their melodramatic, open-ended stories about romance and domestic life.

Smithsonian Magazine· 16 Jun 2026

Formed as series + -al, on model of Latin seriālis, from seriēs + -ālis. Cognate to Italian seriale. First use appears c. 1823. See cite below.

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

This entry
Origin Latin seriālis
Level C1 · Advanced
Frequency Common
Updated