Hayır, bugün toplantı yok.

In Turkish, yok is commonly used to mean there is not / there isn’t / absent / unavailable.

So Bugün toplantı yok literally works like:

• today
• meeting
• not present / nonexistent

A very natural English translation is There’s no meeting today.

Turkish often uses var (there is / there are) and yok (there isn’t / there aren’t) instead of a separate verb like English is in this kind of sentence.

For example:

• Bugün toplantı var. = There is a meeting today.
• Bugün toplantı yok. = There is no meeting today.

Because değil and yok do different jobs.

• değil negates something being identified as something else, or negates adjectives/descriptions.
• yok means something does not exist or is not present.

Here, the idea is not Today is not a meeting.
The idea is There is no meeting today.

So:

• Bugün toplantı yok. = correct
• Bugün toplantı değil. = unnatural / wrong for this meaning

A simple comparison:

• O doktor değil. = He/She is not a doctor.
• Doktor yok. = There is no doctor.

Hayır means No.

It is probably answering a previous question, such as:

• Bugün toplantı var mı? = Is there a meeting today?
• Hayır, bugün toplantı yok. = No, there is no meeting today.

So Hayır is not grammatically required for the sentence itself. It is part of the conversation.

You could say just:

• Bugün toplantı yok.

if you are simply giving information rather than directly answering someone.

Turkish word order is flexible, but this order is very natural.

• bugün = today
• toplantı = meeting
• yok = there isn’t / absent

So Bugün toplantı yok is a normal way to say There’s no meeting today.

Other orders are possible, but they may shift emphasis:

• Toplantı bugün yok. = emphasizes today
• Bugün yok toplantı. = not natural in standard speech

A good rule for learners: in simple sentences like this, placing the time expression first is very common.

Turkish does not use articles like English a / an / the.

So toplantı can mean:

• a meeting
• the meeting
• just meeting as a general concept

The exact meaning depends on context.

In this sentence, English usually translates it as:

• There is no meeting today or
• There isn’t a meeting today

If the context clearly refers to a specific meeting, English might say the meeting, but Turkish still just says toplantı.

Toplantı is the basic dictionary form of the noun, meaning meeting.

It has no case ending here because it is not being marked as a direct object, location, destination, and so on. It is simply the thing whose existence is being talked about.

Compare:

• Bugün toplantı yok. = There is no meeting today.
• Toplantıya gidiyorum. = I am going to the meeting.
• Toplantıdayım. = I am at the meeting.

So here, plain toplantı is exactly what you would expect.

In the present tense, Turkish often does not need an explicit verb equivalent to English is / are in simple nominal sentences.

Also, yok itself carries the core idea of non-existence / absence, so the sentence feels complete without another verb.

That is why:

• Bugün toplantı yok.

is a full sentence.

This is very normal in Turkish. Compare:

• Hava güzel. = The weather is nice.
• Evde kimse yok. = There is nobody at home.

English needs is / there is, but Turkish often does not.

Yes, but it sounds more formal, definite, or sometimes more written/stiff.

• Bugün toplantı yok. = normal everyday speech
• Bugün toplantı yoktur. = more formal, official, or emphatic

For everyday conversation, yok by itself is the most natural choice.

Bugün means today.

It does not need a suffix here because it is being used as a time expression by itself.

Turkish often uses time words without extra marking:

• Bugün geliyorum. = I’m coming today.
• Yarın ders var. = There is class tomorrow.
• Dün evdeydim. = I was at home yesterday.

So bugün is already complete as it is.

Not usually. The most natural meaning is:

• There is no meeting today.

If you want to say The meeting isn’t today, Turkish would usually say something more like:

• Toplantı bugün değil.

That is where değil is correct, because now you are negating today as the time of the meeting.

So compare carefully:

• Bugün toplantı yok. = There is no meeting today.
• Toplantı bugün değil. = The meeting is not today.

Not always. Hayır is the standard word for no, especially as an answer to a yes/no question.

For example:

• Geliyor musun?
• Hayır.

But Turkish also has other ways to express negation depending on context, such as:

• yok = there isn’t / none / not available
• değil = not
• repeating the negative verb form

In this sentence, Hayır answers the question, while yok expresses the absence of the meeting. So both are negative, but they do different things.

Yes, that is possible.

• Bugün toplantı yok. = more neutral and very natural
• Bugün bir toplantı yok. = There isn’t a meeting today

Adding bir can make it feel a bit more like English a meeting, but in many everyday cases Turkish simply leaves it out.

So the version without bir is usually the most natural default.