Esperamos até haver quórum.

Here haver is an impersonal verb meaning to exist / to be in the sense of there being something.

So haver quórum means:

• for there to be a quorum
• for a quorum to exist

This use of haver is fairly formal and is common in legal, administrative, and meeting-related language.

Both are possible, but they are structured differently.

• até haver quórum = until there being a quorum / until there is a quorum
• até que haja quórum = until there is a quorum

The reason is that até by itself can be followed by an infinitive:

• até chegar
• até terminar
• até haver quórum

But if you use até que, then you need a conjugated verb, and that verb usually goes in the subjunctive:

• até que haja quórum

So:

• até + infinitive
• até que + subjunctive

The version with haver is shorter and a bit more formal.

It can be either one, depending on context.

For many -ar verbs in Portuguese, the 1st person plural form is the same in:

• present indicative: nós esperamos = we wait / we are waiting
• preterite: nós esperamos = we waited

So Esperamos até haver quórum could mean either:

• We wait until there is a quorum
• We waited until there was a quorum

Context tells you which one is meant.

For example:

• Agora esperamos até haver quórum. → present
• Ontem esperamos até haver quórum. → past

Portuguese often leaves out subject pronouns when the verb form already makes the subject clear.

So:

• (Nós) esperamos até haver quórum.

The nós is optional.

This is very normal in Portuguese. English usually requires the subject pronoun, but Portuguese often does not.

Because quórum here is being used in a general, institutional sense: the presence of the minimum required number of people.

So haver quórum means simply for quorum to exist.

You could use an article if you were referring to a specific quorum in a more defined way, for example:

• até haver o quórum mínimo exigido

That sounds like:

• until the required minimum quorum exists

But in the basic expression, no article is very natural:

• haver quórum

This sentence sounds somewhat formal or administrative.

In everyday Brazilian Portuguese, people may say things like:

• Esperamos até dar quórum.
• Ficamos esperando até ter quórum.

Especially in spoken language, dar quórum is very common in the context of meetings, assemblies, and voting.

So:

• haver quórum = more formal
• dar quórum = very common in speech

They are related, but not used in exactly the same way.

• haver quórum = for quorum to exist
• ter quórum = to have quorum

Examples:

• Ainda não há quórum. = There still isn’t a quorum.
• A reunião já tem quórum. = The meeting already has a quorum.

In your sentence, até haver quórum sounds more impersonal and formal, almost like until quorum exists.

If you said até ter quórum, it would usually sound more natural if something specific is understood as the thing that has the quorum, such as the meeting or the session.

In Brazilian Portuguese, quórum is pronounced approximately like:

• KWO-rum

More precisely, the stress is on the first syllable:

• QUÓ-rum

The accent mark shows that stressed syllable.

This word comes from Latin and is used in Portuguese as a borrowed noun. The spelling quórum is the standard Portuguese form.

Yes. A very common rewrite is:

• Esperamos até que haja quórum.

If the meaning is in the past, you might also see:

• Esperamos até que houvesse quórum.

These versions are more explicit because they use a full clause with a conjugated verb.

So you can think of the original sentence as a more compact version:

• Esperamos até haver quórum.

And the expanded version:

• Esperamos até que haja/houvesse quórum.

Yes, it is natural, especially in a formal, bureaucratic, or meeting-related context.

It would fit well in situations like:

• assemblies
• board meetings
• official sessions
• voting procedures

In casual conversation, Brazilians might choose a less formal phrasing, but the sentence itself is perfectly correct and natural.