O quórum é suficiente.

In Portuguese, it is very common to use a definite article before a noun when that noun is the subject of the sentence.

So O quórum é suficiente sounds natural and complete.

Leaving out the article — Quórum é suficiente — would usually sound unnatural in normal speech. You might only see article omission in very special contexts, such as headlines, notes, or very technical writing.

Here, o means the, so the structure is simply:

• o quórum = the quorum
• é suficiente = is sufficient

Quórum is masculine in Portuguese, which is why the sentence uses o and not a.

• o quórum
• not a quórum

Even though this word comes from Latin and may feel foreign, in Brazilian Portuguese it is treated as a masculine noun.

Portuguese has two main verbs for to be: ser and estar.

Here, é is from ser, and it is used because suficiente describes an essential condition or status of the quorum in that context — basically, whether it meets the required amount.

So:

• O quórum é suficiente = the quorum is sufficient

Using está would usually sound less natural here. Ser is the normal choice when talking about something being sufficient, necessary, possible, important, etc.

Compare:

• É suficiente. = It is sufficient.
• É necessário. = It is necessary.
• É importante. = It is important.

The accent in é is important because it distinguishes the verb é from the conjunction e.

• é = is
• e = and

So in this sentence:

• O quórum é suficiente. = The quorum is sufficient.

Without the accent, O quórum e suficiente would be incorrect.

The accent mark shows where the stress goes: QUÓ-rum.

In Portuguese, the written accent tells you that the stressed syllable is quó.

So the word is pronounced approximately like:

• QUAW-rum or KWOH-rum

The exact Brazilian pronunciation will vary a little, but the important point is that the stress is on the first syllable.

A good approximate pronunciation for an English speaker is:

• KWO-rum

A few details:

• qu before ó sounds like kw
• the r in the middle is usually a light tap, somewhat like the tt in American English butter
• the final um is nasal in Portuguese, so it does not sound exactly like English rum

So the ending is more nasal than in English. You do not need to make it perfect right away; just aiming for KWO-rum with stress on the first syllable is a very good start.

Suficiente is an adjective, and in the singular it has the same form for masculine and feminine nouns.

So you get:

• o quórum é suficiente
• a quantidade é suficiente

Both use suficiente.

It only changes in the plural:

• os números são suficientes
• as vagas são suficientes

So in your sentence, it stays suficiente because quórum is singular.

Here it is an adjective.

It describes the noun quórum, even though it comes after the verb é.

This is a very common pattern in Portuguese:

• O livro é interessante.
• A resposta é correta.
• O quórum é suficiente.

In all of these, the word after é is an adjective describing the subject.

Usually, no. That would sound unnatural in most situations.

Portuguese normally uses ser with adjectives like:

• suficiente
• necessário
• adequado
• importante

So the natural sentence is:

• O quórum é suficiente.

A learner can usually remember this as a fixed pattern: é suficiente.

Sometimes, yes, but the meaning and style can shift a little.

• O quórum é suficiente. = The quorum is sufficient.
• O quórum é bastante. = This is much less natural in this context.

In formal or institutional contexts, suficiente is the better choice. It sounds precise and matches how people talk about legal, parliamentary, or meeting requirements.

You might also hear:

• Há quórum suficiente. = There is sufficient quorum.
• O quórum é o suficiente. = The quorum is enough.

But for your sentence, suficiente is the standard and best option.

It is fairly common, but mainly in formal or organized contexts, such as:

• meetings
• voting
• committees
• assemblies
• legal or political discussions

You may hear it in sentences like:

• Não houve quórum. = There was no quorum.
• Precisamos de quórum para votar. = We need a quorum to vote.

So it is not an everyday household word for all situations, but it is definitely a standard word in Brazilian Portuguese.

Yes, but the normal and neutral order is:

• O quórum é suficiente.

You could sometimes change the order for style or emphasis, but it would sound more marked or literary. For everyday Portuguese, keep the standard order:

• subject: O quórum
• verb: é
• adjective: suficiente

That is the safest and most natural structure for learners to use.