English Reference
noun · verb

battalion

n. · v.
US /bəˈtæɫjən/ UK /bɐtˈæliən/ bat·tal·ion UK spelling battalion's, battalion's

  1. 01 C1 Advanced Technical Science

    n.a large unit of an army, usually made up of several smaller groups called companies.

    n.a military unit consisting of a headquarters and two or more companies, often forming part of a brigade or regiment.

    Simple

    The battalion marched for three days before reaching the edge of the forest.

    In context

    The infantry battalion was deployed to the border to reinforce existing positions and provide logistical support for the upcoming exercises.

    Usage

    Usually functions as a countable noun; in British English, it may take a plural verb.

  2. 02 C2 Proficiency Literary

    n.a very large number of people or things, especially when they are organised.

    n.a large body of persons or things organised for a specific purpose; often used for emphasis.

    Simple

    A battalion of reporters waited outside the courthouse for the verdict.

    In context

    The CEO was met by a battalion of lawyers, all prepared to defend the company against the recent allegations of fraud.

    Teacher's tip

    This sense is often used with 'of' to describe a daunting or impressive group of people, like lawyers or critics.

  3. 03 C2 Proficiency FormalTechnical

    v.to organise a large group of people into smaller, military-style units.

    v.to form or organise into battalions.

    Simple

    The volunteers were battalionned to make the rescue effort more efficient.

    In context

    The commander ordered the irregular forces to be battalionned under professional officers to ensure better discipline during the campaign.

The chief of the general staff of the Israel Defense Forces (IDF), Eyal Zamir, has ordered a battalion of infantry reservists back from leave to reinforce troops in the West Bank.

The Guardian· 13 Aug 2026

He ordered a battalion of infantry reservists back from leave to reinforce troops in the West Bank.

The Guardian· 13 Aug 2026

From Middle French battaillon (modern French bataillon).

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

This entry
Origin frm battaillon
Level C1 · Advanced
Frequency Frequent
Updated