Он отменил визит.

Отменил is the past tense, masculine singular form of отменить.

That tells you:

• the action happened in the past,
• the subject is one person/thing,
• and the subject is masculine.

So with он, the form отменил matches naturally.

Compare:

• он отменил = he canceled
• она отменила = she canceled
• они отменили = they canceled

This is a question of aspect, which is very important in Russian.

• отменить → perfective
• отменять → imperfective

Он отменил визит uses the perfective verb, so it presents the cancellation as a completed single event.

A rough contrast:

• Он отменил визит = he canceled the visit / he has canceled the visit
• Он отменял визит = he was canceling the visit / he used to cancel the visit / he canceled it at some point in a non-completion-focused way

In most ordinary cases where you mean a specific cancellation that happened, отменил is the natural choice.

It is in a different case here, but for this kind of noun the form happens to look the same.

Визит is:

• masculine
• singular
• inanimate

As the direct object after отменил, it is in the accusative case.
For masculine inanimate singular nouns, the accusative is usually identical to the nominative.

So:

• nominative: визит
• accusative: визит

That is why you do not see a visible ending change.

Визит is in the accusative case because it is the direct object of the verb отменить.

In this sentence:

• он = the doer of the action
• отменил = did the canceling
• визит = the thing that was canceled

Many Russian verbs that take a direct object use the accusative, and отменить is one of them.

Визит often means a visit, but it is usually a bit more formal or specific than the everyday English word visit.

Depending on context, it can mean things like:

• an official visit
• a planned visit
• a doctor’s appointment / professional call
• a diplomatic visit

So in some contexts, English might translate it as:

• visit
• appointment
• call

The exact best translation depends on the situation.

Yes, Russian can often omit the subject pronoun if the context makes it clear.

So you may hear:

• Отменил визит.

This can work if everyone already knows who is being talked about.

However, in the past tense, Russian verbs do not show person the way present-tense forms do.
Отменил tells you masculine singular, but not specifically he. It could also refer to:

• он = he
• a masculine noun, like директор = the director

So он is included when the speaker wants to make the subject clear.

Yes. Russian word order is more flexible than English word order.

The neutral order here is:

• Он отменил визит.

But you could also say:

• Визит он отменил.
• Отменил он визит.

These alternatives are possible, but they change the focus or emphasis.

For example:

• Визит он отменил puts more emphasis on the visit
• Он отменил визит is the most neutral, straightforward version

So the original sentence is the best basic pattern for learners.

Russian has no articles, so there is no direct equivalent of a or the in the sentence.

So Он отменил визит could mean:

• he canceled the visit
• he canceled a visit

Usually, context tells you which one is meant.

This is very normal in Russian. Learners coming from English often expect an article, but Russian simply does not use one.

The stress is:

• он отменИл визИт

A rough pronunciation guide:

• он ≈ on
• отменил ≈ at-mye-NEEL
• визит ≈ vee-ZEET

A few useful notes:

• The stress in отменил is on the last syllable: -нил
• The stress in визит is also on the last syllable: -зит
• Unstressed vowels in Russian are often reduced, so the written о in отменил does not sound like a strong English o

The verb would change to match the subject in gender and number in the past tense.

Examples:

• Он отменил визит. = he canceled the visit
• Она отменила визит. = she canceled the visit
• Оно отменило визит. = it canceled the visit
• Они отменили визит. = they canceled the visit

This is one of the key things to notice about Russian past tense: it agrees with the subject in gender/number, not person.