Chciałabym spotkać się z moją kuzynką w weekend.

Chciałabym means I would like.

Yes, it also tells us the speaker is female. A male speaker would say chciałbym.

So:

• chciałabym = I would like... (said by a woman)
• chciałbym = I would like... (said by a man)

This form is very common in Polish for expressing a wish in a polite, softer way.

These forms are related, but they are not the same:

• chcę = I want
• chciałabym = I would like
• chciałam = I wanted / I wanted to

So:

• Chcę spotkać się z moją kuzynką = I want to meet my cousin
  This is more direct.
• Chciałabym spotkać się z moją kuzynką = I would like to meet my cousin
  This sounds softer and more polite.
• Chciałam spotkać się z moją kuzynką = I wanted to meet my cousin
  This is past tense.

Because after chciałabym (I would like), Polish normally uses the infinitive of the next verb.

So the structure is:

• chciałabym + infinitive

Here:

• chciałabym spotkać się = I would like to meet

This works much like English would like to meet.

Both exist, but they are used a little differently.

• spotkać kogoś = to meet someone / to run into someone
• spotkać się z kimś = to meet up with someone

In this sentence, spotkać się z moją kuzynką sounds like a planned meeting or getting together.

Compare:

• Spotkałam Annę na ulicy. = I met / ran into Anna in the street.
• Spotkałam się z Anną. = I met up with Anna.

So spotkać się z is a very natural choice here.

In this sentence, się is part of the verb expression spotkać się z kimś.

You do not translate it word-for-word as oneself here. It is simply part of how Polish expresses to meet up with someone.

This is very common in Polish: some verbs naturally appear with się, and learners usually just need to learn the full pattern.

So it is best to remember:

• spotkać się z kimś = to meet with / meet up with someone

Because the preposition z here means with, and after z in that meaning, Polish uses the instrumental case.

Base forms:

• moja kuzynka = my cousin
  (female cousin)

After z:

• z moją kuzynką = with my cousin

So both words change:

• moja → moją
• kuzynka → kuzynką

This is one of the most important patterns to learn:

• z kim? = with whom? → instrumental

Yes, you can say:

• Chciałabym spotkać się z kuzynką w weekend.

But that is less specific. It can sound like with a/the cousin, depending on context.

Using moją makes it fully clear that you mean my cousin.

So:

• z moją kuzynką = definitely with my cousin
• z kuzynką = with a cousin / with my cousin, depending on context

Yes. Kuzynka means female cousin.

So:

• kuzynka = female cousin
• kuzyn = male cousin

Because this sentence uses kuzynką, the speaker wants to meet a female cousin.

If it were a male cousin, it would be:

• Chciałabym spotkać się z moim kuzynem w weekend.

This is about aspect, which is very important in Polish.

• spotkać się = perfective
  usually for one completed meeting
• spotykać się = imperfective
  usually for repeated, habitual, or ongoing meetings

In this sentence, the speaker wants one meeting this weekend, so spotkać się is the natural choice.

Compare:

• Chciałabym spotkać się z moją kuzynką w weekend.
  = one meeting
• Lubię spotykać się z moją kuzynką w weekendy.
  = I like meeting my cousin on weekends / regularly

For the time expression on/during the weekend, Polish normally says:

• w weekend

That is the standard form here.

If you add a word like this or next, you can see the pattern more clearly:

• w ten weekend = this weekend
• w przyszły weekend = next weekend

This shows that Polish treats it like the kind of time expression that uses the accusative here. Since weekend is a masculine inanimate noun, its nominative and accusative singular look the same, so you just see weekend.

So for this meaning:

• w weekend = correct
• w weekendzie = not used here

By itself, w weekend usually means at the weekend / this weekend / over the weekend, depending on context.

If you want to clearly mean on weekends in general, Polish usually says:

• w weekendy = on weekends

So:

• Chciałabym spotkać się z moją kuzynką w weekend.
  = I’d like to meet my cousin this weekend / over the weekend
• Spotykam się z kuzynką w weekendy.
  = I meet my cousin on weekends

No, Polish word order is fairly flexible, because the endings show the grammatical relationships.

The original sentence is a very natural, neutral order:

• Chciałabym spotkać się z moją kuzynką w weekend.

But you could also say:

• W weekend chciałabym spotkać się z moją kuzynką.
  This emphasizes when.
• Z moją kuzynką chciałabym spotkać się w weekend.
  This emphasizes with whom.

So the original order is normal and smooth, but other orders are possible for emphasis.

It is neutral and natural. It works well in everyday speech and writing.

It is not overly formal, but it is also not rude or blunt. Using chciałabym makes it sound polite and pleasant.

So this sentence would be fine in many situations, for example when telling a friend your plans or politely expressing what you want to do.