لدينا موعد مع الطبيب بعد ساعة.

Yes, لدينا is how Arabic often expresses we have.

Literally, لدينا means something like with us or in our possession:

• لدى = with / in the possession of
• نا = us / we

So:

• لدينا موعد = we have an appointment

Arabic usually does not use a separate verb meaning to have the way English does. Instead, it often uses expressions like:

• عندي = I have
• عندنا = we have
• لديك = you have
• لديه = he has

In this sentence, لدينا is a slightly more formal or written-style way to say we have.

Yes, عندنا موعد مع الطبيب بعد ساعة is also correct.

The difference is mainly one of style:

• عندنا is very common and natural in everyday speech.
• لدينا is a bit more formal and is especially common in Modern Standard Arabic and writing.

So in MSA, لدينا موعد sounds very normal and polished.

موعد usually means appointment, meeting time, or scheduled time.

In this sentence, it means appointment:

• موعد مع الطبيب = an appointment with the doctor

It can also be used in other contexts, for example:

• لدي موعد غدًا = I have an appointment tomorrow
• ما موعد الاجتماع؟ = What time is the meeting?

So the core idea is a fixed or arranged time.

Because Arabic often says we have an appointment rather than we have the appointment unless the appointment is being identified as a specific one already known in the conversation.

So:

• لدينا موعد = we have an appointment
• لدينا الموعد would sound much less natural in most contexts

Even if English might sometimes say the appointment, Arabic often prefers the indefinite noun here.

Because مع means with, and that is the normal way to say an appointment with someone.

So:

• موعد مع الطبيب = an appointment with the doctor

If you used إلى, that would mean to the doctor, which does not express the same relationship.

Compare:

• موعد مع الطبيب = an appointment with the doctor
• أذهب إلى الطبيب = I am going to the doctor

So مع is used because the noun موعد is followed by the person you are meeting.

Both are possible, but they mean slightly different things:

• مع الطبيب = with the doctor
• مع طبيب = with a doctor

In the sentence given, الطبيب suggests a specific doctor is meant, probably one already known to the speaker.

This is very natural if you mean:

• your doctor
• the doctor you are scheduled to see
• a doctor already understood from context

In this kind of sentence, بعد ساعة usually means in an hour or one hour from now.

Literally, it is after an hour, but in natural English the idea is:

• لدينا موعد مع الطبيب بعد ساعة = We have a doctor's appointment in an hour

So the Arabic expression is literal, but the best English meaning in context is usually in an hour.

Because the sentence means after one hour / in one hour.

Arabic often uses the singular noun after expressions like this:

• بعد ساعة = after an hour / in an hour
• بعد يوم = after a day / in a day
• بعد أسبوع = after a week / in a week

If you wanted after two hours or after three hours, the structure would change:

• بعد ساعتين = after two hours
• بعد ثلاث ساعات = after three hours

Because Arabic often uses a nominal sentence in the present tense, with no explicit present-tense verb to be.

So Arabic can say:

• لدينا موعد
  literally: with us an appointment

and this naturally means:

• we have an appointment

This is completely normal in Arabic. Present-tense is/are is usually not written as a separate word in sentences like this.

With full case endings, the sentence would be:

لَدَيْنَا مَوْعِدٌ مَعَ الطَّبِيبِ بَعْدَ سَاعَةٍ

Here is why:

• مَوْعِدٌ has -un because it is nominative and indefinite
• الطَّبِيبِ has -i because it comes after the preposition مع
• سَاعَةٍ has -in because it comes after the preposition بعد and is indefinite

So the prepositions مع and بعد make the following noun genitive.

Yes, Arabic word order is fairly flexible, though some versions sound more natural than others.

The given sentence:

• لدينا موعد مع الطبيب بعد ساعة

is very natural.

You could also say:

• بعد ساعة لدينا موعد مع الطبيب = In an hour, we have an appointment with the doctor

This changes the emphasis slightly by foregrounding the time.

However, the original order is a very standard and neutral way to say it.

A careful MSA pronunciation would be approximately:

ladaynā mawʿidun maʿa ṭ-ṭabībi baʿda sāʿatin

A few notes:

• لدينا = la-day-nā
• موعد contains the consonant ع, which has no exact English equivalent
• الطبيب is pronounced aṭ-ṭabīb, because ط is a sun letter, so the l of ال is assimilated
• بعد also contains ع

So in connected speech:

ladaynā mawʿidun maʿa ṭ-ṭabībi baʿda sāʿatin

مع الطبيب is a prepositional phrase meaning with the doctor, and it modifies موعد.

So the core structure is:

• لدينا موعد = we have an appointment

Then Arabic adds more information about that appointment:

• مع الطبيب = with the doctor
• بعد ساعة = in an hour

So the whole sentence builds up like this:

• لدينا موعد
• لدينا موعد مع الطبيب
• لدينا موعد مع الطبيب بعد ساعة

You would change لدينا to لديّ:

• لديّ موعد مع الطبيب بعد ساعة

That means:

• I have an appointment with the doctor in an hour

Some other forms are:

• لديك موعد = you have an appointment
• لديه موعد = he has an appointment
• لديها موعد = she has an appointment
• لدينا موعد = we have an appointment