Прийом завтра.

Yes. In Ukrainian, short verbless sentences like this are very common, especially in:

• notices
• schedules
• announcements
• brief spoken replies

English usually needs something like is or will be, but Ukrainian can leave that out when the meaning is obvious from context.

So a sentence of the pattern Noun + time word is perfectly natural:

• Зустріч о третій.
• Лекція в понеділок.
• Прийом завтра.

It sounds concise and natural, especially in practical contexts.

Because Ukrainian has no articles. There is no direct equivalent of a, an, or the.

So прийом can mean something like:

• a reception / an appointment / office hours
• the reception / the appointment / the office hours

Which one is intended depends on context, not on an article.

Завтра is an adverb meaning tomorrow.

In this sentence, it tells you when something happens. Since it is an adverb, it does not change form for case, gender, or number.

So here:

• прийом = the event / appointment / reception
• завтра = when it takes place

Both are possible.

Ukrainian word order is more flexible than English, and changing the order usually changes the focus or emphasis, not the basic meaning.

• Прийом завтра. = puts the spotlight first on the appointment/reception
• Завтра прийом. = puts the spotlight first on tomorrow

The version with Прийом first can sound a bit like a short notice or confirmation:

• Прийом завтра. Не сьогодні.

It is nominative singular.

More specifically:

• dictionary form: прийом
• gender: masculine
• number: singular
• case: nominative

In a short sentence like this, the noun often stays in the nominative because it functions as the main named item of the statement.

No. Прийом is a context-dependent word and can have several meanings.

Common ones include:

• a reception
• an appointment
• office hours / consultation hours
• an admission / intake
• a method / technique
• a move or maneuver

So learners often need to rely on context to know which meaning is intended. The grammar of the sentence does not tell you the exact sense by itself.

A simple approximation is:

pry-YOM ZA-vtra

A few useful notes:

• прийо́м has the stress on the last syllable: -йом
• за́втра has the stress on the first syllable: за́-
• Ukrainian и is not the English ee sound
• the йо part sounds roughly like yo

So:

• прийо́м
• за́втра

If you want to sound more natural, make sure the stress is correct.

Yes. Прийом буде завтра. is also correct and is more explicit.

Compare them:

• Прийом завтра. = shorter, more compact, notice-like
• Прийом буде завтра. = fuller, more explicit

In everyday Ukrainian, especially in signs, schedules, and quick speech, the shorter version is very common.

It can be both, but it especially fits the style of a:

• notice
• schedule entry
• clinic or office message
• short practical statement

For example, it would sound natural on a door, in a message, or in a quick reply.

In longer, more conversational speech, someone might choose a fuller version, but the short version is still completely natural.