A csapattársak együtt regisztrálnak.

Yes. A is the Hungarian definite article, meaning the.

A useful thing to know is that Hungarian does not change the definite article for singular vs. plural:

• a csapattárs = the teammate
• a csapattársak = the teammates

So even though csapattársak is plural, the article is still a.

Also:

• a is used before consonant sounds
• az is used before vowel sounds

Since csapattársak starts with a consonant sound, it takes a.

Csapattársak means teammates.

It can be broken down like this:

• csapat = team
• társ = companion / partner / mate
• csapattárs = teammate
• csapattársak = teammates

Hungarian very often forms nouns by combining smaller words into one compound word, so csapattárs is completely natural as a single word.

The -ak is the plural ending here.

So:

• csapattárs = teammate
• csapattársak = teammates

In Hungarian, plural is often marked with -k, but the actual form may be -ok, -ek, -ök, -ak, etc., depending on the word and vowel harmony.

So English learners should think of -ak here as the plural marker attached in the form that fits this noun.

Együtt means together.

It is an adverb, describing how the action happens:

• regisztrálnak = they register
• együtt regisztrálnak = they register together

It tells us that the teammates are doing the action jointly, not separately.

Because that is a very natural position for an adverb in Hungarian.

In a neutral sentence like this, Hungarian often puts:

1. the topic or subject first
2. then an adverb or other modifier
3. then the verb

So:

• A csapattársak együtt regisztrálnak.

This is a normal, neutral way to say The teammates register together.

Hungarian word order is flexible, though, and changing the order can change emphasis.

Regisztrálnak is the verb regisztrál in 3rd person plural, present tense.

Breakdown:

• regisztrál = to register
• regisztrálnak = they register / are registering

The -nak / -nek ending is a common marker for they in the present tense.

So the verb agrees with the plural subject csapattársak.

This is a very good question, because Hungarian has two main verb conjugations: indefinite and definite.

Here we have:

• regisztrálnak = they register

This is the indefinite conjugation, used because there is no definite direct object in the sentence.

If there were a definite object, Hungarian might use the definite conjugation instead. For example:

• A csapattársak a csapatot regisztrálják. = The teammates are registering the team.

But in your sentence, the meaning is simply that they themselves are registering, or that they are registering together, without a stated definite object. So regisztrálnak is the correct form.

No, it is a loanword, ultimately related to international words like register or registration.

Hungarian uses many international verbs of this kind, especially in formal, administrative, technical, or online contexts. Even though the word is borrowed, it behaves like a normal Hungarian verb and takes normal Hungarian endings:

• regisztrálok = I register
• regisztrálsz = you register
• regisztrál = he/she registers
• regisztrálnak = they register

So it may look familiar to an English speaker, but the grammar around it is fully Hungarian.

The most natural translation is:

The teammates register together.

Depending on context, English could also say:

• The teammates are registering together.
• The team members register together.

Hungarian present tense can cover both a simple present and a present continuous meaning, so the exact English translation depends on context.

A rough pronunciation guide:

• A ≈ short aw
• cs sounds like ch in church
• csapattársak ≈ chaw-pawt-taar-shawk
• együtt:
  
  • gy is a soft consonant, somewhat like the d in British duke or a softened dy
  • ü has no exact English equivalent; it is like saying ee with rounded lips
• regisztrálnak:
  • sz sounds like English s
  • s by itself in Hungarian sounds like English sh
  • á is a long a, somewhat like in father

A rough full approximation: aw CHAW-pawt-taar-shawk EH-dyütt reh-gees-TRAAL-nawk

Not exact, but it helps.

Yes. Hungarian word order is flexible, but different orders give different emphasis.

Your sentence:

• A csapattársak együtt regisztrálnak.

This is a neutral statement: The teammates register together.

Other orders are possible, depending on what you want to emphasize. For example, if together is especially important, Hungarian can place stronger focus on it.

So learners should not think of Hungarian word order as random, but as meaningful and emphasis-based. The version you have is a very natural basic one.