Σε αυτό το μήνυμα το κόμμα αλλάζει λίγο το νόημα.

Σε is a very common preposition in Greek. Depending on context, it can mean in, at, on, or to.

Here, σε αυτό το μήνυμα means in this message.

So the sentence begins by setting the context: in this message.

A useful pattern to remember is:

• σε + accusative noun/pronoun

In this sentence, αυτό το μήνυμα is the phrase that follows σε.

In Greek, this is often expressed with:

• αυτός / αυτή / αυτό
  • definite article
    • noun

So:

• αυτό το μήνυμα = this message

That may feel unusual to an English speaker, because English just says this message without the. But in Greek, this structure is completely normal.

All three parts agree with the noun:

• αυτό = neuter singular
• το = neuter singular article
• μήνυμα = neuter singular noun

Because all three nouns are neuter singular nouns.

In Greek, nouns have grammatical gender:

• masculine
• feminine
• neuter

The article το is used here because:

• το μήνυμα = the message
• το κόμμα = the comma
• το νόημα = the meaning

This is something English speakers need to get used to, because English nouns usually do not show grammatical gender this way.

The subject is το κόμμα.

So the core of the sentence is:

• το κόμμα αλλάζει λίγο το νόημα
• the comma changes the meaning a little

Here:

• το κόμμα = subject
• αλλάζει = verb
• το νόημα = object

This can be confusing because with neuter singular nouns, the nominative and accusative forms often look the same. So form alone does not always tell you which noun is the subject. You often rely on:

• word order
• context
• meaning

Αλλάζει is the 3rd person singular present form of αλλάζω, which means to change.

So:

• αλλάζω = I change
• αλλάζει = he/she/it changes

Since the subject is το κόμμα (the comma), Greek uses αλλάζει:

• το κόμμα αλλάζει = the comma changes

Like the English present tense, the Greek present can describe either a general fact or something happening in the current situation, depending on context.

Here λίγο means a little or slightly, and it works as an adverb.

It modifies the verb αλλάζει, not a noun:

• αλλάζει λίγο = changes a little / changes slightly

So the idea is not that the meaning changes completely, but only slightly.

Yes. Greek word order is more flexible than English word order.

The sentence begins with Σε αυτό το μήνυμα to set the frame first:

• In this message, ...

Then it gives the main point:

• the comma changes the meaning a little

A version like this is also possible:

• Το κόμμα αλλάζει λίγο το νόημα σε αυτό το μήνυμα.

That still makes sense, but it places the focus differently. The original sentence sounds natural because it starts with the context.

No. Κόμμα can also mean political party.

So this word has more than one meaning, and context tells you which one is meant.

In this sentence, because the sentence talks about changing meaning in a message, το κόμμα clearly means the comma.

Greek uses the definite article very often, and here it refers to specific things:

• το κόμμα = the specific comma being discussed
• το νόημα = the meaning of this message

So the sentence is not talking about commas and meaning in a very general way. It is talking about a particular case: in this message, the comma changes the meaning a little.

Yes. Very often σε is shortened before a vowel.

So you may also see:

• σ’ αυτό το μήνυμα

This means exactly the same thing as:

• σε αυτό το μήνυμα

The full form in your sentence is perfectly normal, and the shortened form is also very common.