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Justyna Jupowicz-Kozak

CEO of Professional Science Editing for Scientists @ prosciediting.com

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on a purpose

Grammar usage guide and real-world examples

USAGE SUMMARY

The phrase "on a purpose" is not grammatically correct and should not be used in written English.
The correct phrase is "on purpose" which means intentionally or deliberately. Example: She bumped into the table on purpose to get his attention.

⚠ May contain grammatical issues

Science

News & Media

Academia

Human-verified examples from authoritative sources

Exact Expressions

21 human-written examples

But from a distance, a powerful portrait emerges, the marks of color suddenly taking on a purpose.

** Unable to settle on a purpose — unable, even, to realize that he lacks one — he becomes a polite, obedient employee.

News & Media

The New Yorker

Unable to settle on a purpose — unable, even, to realize that he lacks one — he becomes a polite, obedient employee.

News & Media

The New Yorker

But even this obstruction, after a while, takes on a purpose.

Conduit borrower means the obligor on a purpose investment (as defined in § 1.148-1).

Evidence in the form of experiments performed on a purpose built rig has established that tangential vibration at certain frequencies and amplitudes influences surface finish.

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Human-verified similar examples from authoritative sources

Similar Expressions

39 human-written examples

Participants were instructed to press one of two buttons on a purpose-built response box, using the index finger of each hand, to indicate as quickly and as accurately as possible the type of target.

Participants were instructed to press one of two vertically positioned buttons on a purpose-built response box, using the index finger of each hand, to indicate as quickly and as accurately as possible the type of target (i.e., they were instructed to press the upper key if the arrow pointed up).

Baseline characteristics were recorded on a purpose-designed computerized database.

Science

Bone

The bands play on a purpose-built wooden stage, before an idyllic, copse-enclosed green.

Launched in June, the stylish and contemporary OFF Seine hotel is on a purpose-built barge docked on the Seine.

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Expert writing Tips

Best practice

Always use "on purpose" to indicate intentionality. For example, "He broke the vase on purpose" is correct.

Common error

Avoid using "on a purpose" as it's grammatically incorrect. Use "on purpose" instead. For example, do not say "She did it on a purpose"; instead, say "She did it on purpose".

Antonio Rotolo, PhD - Digital Humanist | Computational Linguist | CEO @Ludwig.guru

Antonio Rotolo, PhD

Digital Humanist | Computational Linguist | CEO @Ludwig.guru

Source & Trust

83%

Authority and reliability

2.2/5

Expert rating

Real-world application tested

Linguistic Context

The phrase "on a purpose" is grammatically incorrect and rarely used. Its intended function is to express intentionality or deliberation, but it fails to do so effectively due to its non-standard construction. Ludwig AI confirms this with its analysis.

Expression frequency: Rare

Frequent in

Science

33%

News & Media

33%

Academia

33%

Less common in

Formal & Business

0%

Encyclopedias

0%

Wiki

0%

Ludwig's WRAP-UP

In summary, the phrase "on a purpose" is grammatically incorrect. The correct and commonly used phrase is "on purpose", which conveys the meaning of intentionally or deliberately. While Ludwig provides a few examples of "on a purpose" from varied sources, Ludwig AI highlights that it should be avoided in favor of its correct counterpart. Always opt for "on purpose" or other synonyms like "deliberately" or "intentionally" to ensure clarity and grammatical accuracy in your writing.

FAQs

What does "on purpose" mean?

"On purpose" means intentionally or deliberately. It indicates that an action was not accidental but was done with a specific intention.

Is "on a purpose" grammatically correct?

No, "on a purpose" is not grammatically correct. The correct phrase is "on purpose".

What can I say instead of "on purpose"?

You can use alternatives like "deliberately", "intentionally", or "purposely" to convey a similar meaning.

Which is correct, "on a purpose" or "on purpose"?

"On purpose" is the correct phrase. "On a purpose" is grammatically incorrect and should be avoided.

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Source & Trust

83%

Authority and reliability

2.2/5

Expert rating

Real-world application tested

Most frequent sentences: