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Prepositions with nouns

On topic or off topic?

On topic and off topic are common expressions in discussions and meetings. Of topic is not standard in current English.

Quick answer

Which expression is correct?

Use on topic for something relevant and off topic for something unrelated. Of topic is not a standard expression in English.

Please stay on topic during the meeting.
His comment was completely off topic.
The discussion remained on topic for an hour.
That joke was a little off topic.

Choose the pattern by meaning

These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.

1
on topic

Showing relevance

Use on topic when something relates directly to the subject being discussed.

The speaker stayed on topic throughout the presentation.
2
off topic

Showing irrelevance

Use off topic when something does not relate to the current subject.

Their conversation drifted off topic after lunch.
3
topic of + noun

Naming the subject of something

Use topic of when introducing the subject area of a discussion or text.

The topic of climate change came up again.

See the difference in context

The same subject can take different constructions because each sentence answers a different question.

Construction
Example
Meaning
on topic
Her answer was clear and on topic.
relevant to the subject
off topic
That question is slightly off topic.
not relevant to the subject
of topic
The phrase of topic is not standard English.
generally considered incorrect
topic of
The topic of the lecture was urban design.
the subject being discussed

Common mistakes

Some combinations appear in real text but do not mean what learners often assume.

Using of topic as a fixed phrase

English uses on topic and off topic, not of topic.

✕ Please keep your comments of topic. ✓ Please keep your comments on topic.

Using off topic for a relevant point

Off topic means unrelated to the discussion.

✕ Her detailed explanation was off topic. ✓ Her detailed explanation was on topic.

Forgetting the verb before on topic

On topic often follows verbs like stay, keep, or remain.

✕ The speaker on topic all day. ✓ The speaker stayed on topic all day.

Confusing topic of with on topic

Topic of names the subject itself, while on topic describes relevance.

✕ The meeting was topic of budget cuts. ✓ The meeting was on topic about budget cuts.

Quick practice

Choose the expression that matches the intended meaning.

1. Please stay ___ topic during the interview.
2. His story was completely ___ topic.
3. The phrase ___ topic is not standard English.

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Frequently asked questions

Is of topic correct English?

No. Standard English uses on topic or off topic instead.

What does on topic mean?

It means relevant to the current subject or discussion.

Can off topic be used politely?

Yes. People often say a comment is slightly off topic when it does not fit the discussion.

of, about, against, to or for racism? of, about, for, in or on friendship? of, about, for, on or to thing? of, about, for, to or with sex? of, about, on, to or for moon? "of access" or "with access"? "of accommodation" or "for accommodation"? "of accuracy" or "for accuracy"? "of action" or "in action"? "of actor", "with actor" or "by actor"? "of address" or "to address"? "of administration" or "in administration"?

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