English Reference

Word

behalf

Phoneticsbe·half

US/bɪˈhæf/

UK/bɪhˈɑːf/

Definitions

01representing someone

B2

n. acting as a representative for another person or a group.

n. acting as the agent or representative of another party. In British English, 'on behalf of' covers both representation and benefit.

“The lawyer spoke on behalf of her client during the meeting.”

“The class president accepted the award on behalf of the entire student body, thanking the faculty for their continued support.”

Formal

Usage

Almost always used in the phrase 'on behalf of'.

Pitfall

I am writing in behalf of my company.

I am writing on behalf of my company.

While 'in behalf of' exists, 'on behalf of' is the standard choice for representation in most modern contexts.

Teaching tip

This is a high-frequency phrase in formal emails and speeches when one person speaks for a whole group.

02for someone's benefit

C1

n. doing something to help someone or for their good.

n. acting in the interest or for the benefit of someone else. In American English, 'in behalf of' is sometimes specifically reserved for this 'benefit' sense.

“A collection was started in behalf of the families who lost their homes.”

“The foundation campaigned tirelessly in behalf of refugee children, ensuring they had access to legal counsel and medical care.”

Formal · American English

Usage

Often appears as 'in behalf of' in American legal or formal writing to mean 'for the benefit of'.

Teaching tip

Most learners only need 'on behalf of'. This 'benefit' distinction is subtle and primarily found in formal American prose.

Real-World Examples

“Under the new rules, that country will organise the concert "in its own right" and "will not be required to stage the event on behalf of another member".”
The Local · 13 Aug 2026
“For those developing AI tools which are designed to take actions on a person's behalf, there is a careful balance to be struck between harnessing their benefits and exposing their risks.”
BBC News · 6 Aug 2026
“Meanwhile, lawyers acting on behalf of victims' families have focused on the moment at which an emergency power system began to operate.”
BBC News · 10 Jun 2026

Etymology

From Middle English bihalve (“nearby”), from Old English bī healfe (“by [his/her] side”), from bī (“by”) + healfe (“side, half”), equivalent to be- + half.

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

This entry

Level
C1 · Advanced
Frequency
Common
Updated

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English Reference