تسجيل المغادرة غدا.

It is most naturally understood as a short elliptical phrase used in a sign, schedule, notice, or booking context.

Arabic often leaves out words that are easy to understand from context. So this can function perfectly well as a complete message, even though it does not contain a finite verb like will be.

A fuller version might be something like:

• موعد تسجيل المغادرة غدًا = the check-out time is tomorrow
• سيكون تسجيل المغادرة غدًا = check-out will be tomorrow

So yes, it can stand on its own, especially in practical contexts.

Because Arabic often uses a verbal noun instead of a full verb in notices and labels.

Here, تسجيل is the maṣdar of سجّل. A maṣdar is the action noun, similar to English words like registration, recording, or checking in/out.

So instead of saying something like:

• ستغادرون غدًا
• سيكون تسجيل المغادرة غدًا

the Arabic simply uses the action itself:

• تسجيل المغادرة غدًا

This is very common in formal, written, and practical Arabic.

تسجيل is a verbal noun (maṣdar) from سجّل.

That means it names the action itself rather than saying who does it or when it happens.

So grammatically, تسجيل is a noun, not a verb.

That is why this expression is built like a noun phrase rather than a verbal sentence.

They form an iḍāfa construction, often called a genitive construction or noun annexation.

So:

• تسجيل = registration / check-in / check-out process
• المغادرة = the departure

Together:

• تسجيل المغادرة = departure registration / check-out

In an iḍāfa:

• the first noun does not take الـ
• the second noun can be definite or indefinite
• the whole phrase gets its definiteness from the second noun

So تسجيل المغادرة is a standard noun-noun structure.

Because that is how iḍāfa works.

In an iḍāfa construction, the first noun usually does not take الـ. The second noun is the one that shows definiteness.

So:

• تسجيل المغادرة = the check-out / departure registration

If you put الـ on the first word too, you would break the normal iḍāfa pattern.

So التسجيل المغادرة would be wrong here.

Yes. المغادرة is also a maṣdar.

It comes from غادر = to leave / depart.

So this phrase is interesting because it combines two action nouns:

• تسجيل = registering
• المغادرة = departing / departure

Literally, it is something like registration of departure, though in context the natural meaning is check-out.

Because غدًا functions as an adverb of time.

Just like English says tomorrow without a preposition, Arabic can also simply say:

• غدًا = tomorrow

So you do not need في here.

This is completely normal:

• سأسافر غدًا = I will travel tomorrow
• الامتحان غدًا = the exam is tomorrow
• تسجيل المغادرة غدًا = check-out tomorrow

You may sometimes see expressions like في الغد, but غدًا by itself is the ordinary and very common form.

They are the same word.

• غدًا is the fully vocalized form
• غدا is the usual unvowelled spelling in everyday writing

The final tanwīn fatḥ in غدًا shows the grammatical ending. Since normal Arabic writing usually leaves out short vowels and tanwīn, people commonly write just غدا.

So for learners:

• غدًا = more fully marked
• غدا = normal spelling in most real texts

In careful fully inflected MSA, you could read it as:

• تسجيلُ المغادرةِ غدًا

Here is why:

• تسجيلُ is nominative
• المغادرةِ is genitive because it is the second part of an iḍāfa
• غدًا is accusative because it is an adverb of time

In normal modern writing and in most speech, these endings are usually not written or pronounced fully.

A careful MSA reading with endings would be:

• tasjīlu l-mughādarati ghadan

A more pause-based or learner-friendly reading without full case endings would be close to:

• tasjīl al-mughādara ghadan

A few sound notes:

• تسجيل has a long ī sound: tas-jīl
• غ is the Arabic gh sound, made in the back of the throat
• ج in standard teaching is usually pronounced like j in judge
• المغادرة has a long ā sound in the middle

Yes. By itself, تسجيل is a broad word. Depending on context, it can mean things like:

• registration
• recording
• enrollment
• check-in / check-out procedure

So the exact meaning depends on what follows it and on the situation.

With المغادرة, the phrase points to departure/check-out, not audio recording or general registration. Context is what makes the intended meaning clear.