Compreendo o sentido da mensagem.

A word-by-word breakdown is:

• Compreendo = I understand / I comprehend
• o = the (masculine singular)
• sentido = sense / meaning / point
• da = of the
  
  • this is a contraction of de + a
• mensagem = message

So the structure is literally:

I understand the meaning of the message.

Portuguese often leaves out the subject pronoun when it is clear from the verb form.

• Compreendo already means I understand
• so Eu compreendo o sentido da mensagem is possible, but eu is not necessary

This is very common in Portuguese, including European Portuguese. The verb ending usually tells you who the subject is.

Compreendo is the:

• 1st person singular
• present indicative
• of the verb compreender = to understand / to comprehend

So:

• eu compreendo = I understand
• tu compreendes = you understand
• ele/ela compreende = he/she understands

In this sentence, compreendo means I understand in a present, straightforward statement.

They are very close in meaning, and in many contexts both can mean to understand.

However, there can be a slight nuance:

• entender is often the more everyday, general verb
• compreender can sound a bit more careful, deliberate, or slightly more formal

So:

• Entendo a mensagem = very natural, common
• Compreendo a mensagem = also correct, slightly more formal or thoughtful in tone

In European Portuguese, both are used.

Yes. Sentido literally means sense, but in this sentence it means something like:

• meaning
• point
• intended sense

So o sentido da mensagem means:

• the meaning of the message
• the point of the message

This is a little more nuanced than just the message itself. It suggests understanding what the message is really saying.

Because the sentence is focusing on the meaning or point of the message, not just the message as an object.

Compare:

• Compreendo a mensagem = I understand the message
• Compreendo o sentido da mensagem = I understand the meaning / point of the message

The second version is more explicit. It emphasizes interpretation, not just reception.

In Portuguese, de + a normally contracts to da.

So:

• de a mensagem becomes da mensagem

This is standard and required in normal Portuguese.

Other common contractions are:

• de + o = do
• em + a = na
• em + o = no
• a + a = à

So o sentido da mensagem literally comes from:

• o sentido de a mensagem
• but correctly written as o sentido da mensagem

Portuguese uses definite articles more often than English does.

Here:

• o sentido = the meaning
• a mensagem = the message

In Portuguese, this sounds natural and complete. English sometimes drops articles where Portuguese keeps them, but in this sentence both articles are expected.

It is correct and natural, but it sounds somewhat careful or slightly formal.

A European Portuguese speaker might also say:

• Entendo a mensagem.
• Percebo a mensagem.
• Compreendo a mensagem.
• Percebo o sentido da mensagem.

Your original sentence is perfectly fine, especially in writing or in a thoughtful discussion. It sounds a bit more deliberate than casual everyday speech.

Yes, you could.

In European Portuguese, perceber is very commonly used to mean to understand.

So:

• Percebo o sentido da mensagem = I understand the meaning of the message

This is very natural in Portugal. In fact, perceber is often more common in everyday European Portuguese than learners expect.

A rough pronunciation guide is:

• Compreendo → kom-pri-EN-doo
• o sentido → u sen-TEE-doo
• da mensagem → da men-SAH-zheng

A few useful points:

• the stress is on -en- in compreendo
• the stress is on -ti- in sentido
• the stress is on the last syllable of mensagem

In European Portuguese, unstressed vowels are often reduced, so the real pronunciation is more closed and less fully pronounced than in spelling. That is normal.

No, not in this sentence.

Although sentido can have different meanings depending on context, here it means:

• meaning
• sense
• point

It does not mean feeling here.

Some possible meanings of sentido in other contexts are:

• direction
• sense
• meaning
• feeling only in more specific expressions, not in this sentence

So in o sentido da mensagem, the correct idea is the meaning of the message.

Yes, in many contexts it would.

• Compreendo o significado da mensagem = I understand the meaning of the message

The difference is subtle:

• significado = more directly meaning
• sentido = sense / point / intended meaning

So sentido can sometimes sound a little broader or more interpretive, while significado can sound a little more literal.

Both are correct here, but sentido is a very good choice if you mean the point or what the message is trying to convey.