English Reference

Word

infantry

Phoneticsin·fantry

US/ˈɪnfəntɹi/

UK/ˈɪnfəntɹˌi/

Definitions

01soldiers on foot

B2 · Upper Intermediate Uncountable noun Military

n. soldiers who are trained to fight on foot on the ground.

n. the branch of an army that fights on foot, distinguished from cavalry, artillery, or armoured units.

“The infantry marched for three days to reach the edge of the forest.”

“Modern infantry units are often transported by helicopter or armoured vehicle, yet their primary role remains engaging the enemy on foot.”

Usage

Often used as an uncountable collective noun or as a modifier before another noun.

Synonyms

foot soldiersground troops

Antonyms

02children

C1 · Advanced Plural noun Humorous · Informal

n. a funny way to talk about a group of babies or small children.

n. a humorous, colloquial application of the military term to refer to infants or young children.

“We need to clear the toys off the floor before the infantry arrives for the party.”

“The quiet afternoon was abruptly terminated by the arrival of the local infantry, as six toddlers burst into the garden screaming.”

Teaching tip

This is a play on the word 'infant'. It is rarely used in serious writing and is mostly found in lighthearted conversation.

Real-World Examples

“The airborne infantry division is focused on parachute assaults.”
Al Jazeera 2 Oct 2026
“Robots are increasingly taking a key role in combat and replacing human infantry.”
The Guardian 4 Apr 2026
“It’s 1946 and infantry officer Philip Deval, who saw action in Normandy, is deployed to the Holy Land to take part in maintaining Britain’s mandate in Palestine.”
The Guardian 14 Sept 2026

Etymology

From Middle French infanterie, from older Italian, possibly from Spanish infantería (“foot soldiers, force composed of those too inexperienced or low in rank for cavalry”), from infante (“foot soldier”), originally "a youth", either way from Latin īnfāns (“child”); see there for more.

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

Domain

Military

This entry

Exam level
CambridgeCambridgeCambridge English QualificationsThe exam suite from Cambridge University Press & Assessment, from A1 Movers up to C2 Proficiency. The benchmark names double as CEFR labels.C1 AdvancedIELTSIELTSInternational English Language Testing SystemThe 0–9 band test co-owned by the British Council, IDP, and Cambridge. Used for university entry, work, and migration.7.0–8.0TOEFL iBTTOEFL iBTTest of English as a Foreign Language, Internet-Based TestETS's academic English test, the standard route for US university admissions. Scored 0–120, with a 1–6 scale since 2026.1–6 scale: 5.0–5.595–113TOEICTOEICTest of English for International CommunicationETS's workplace English test, big in Japan and Korea. Listening & Reading scores 10–990 and tops out at C1.945–990
Frequency
Frequent
Level
C1 · Advanced
Updated

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English Reference