Așteaptă măcar o oră.

Here, Așteaptă is the singular informal imperative of a aștepta, so it means Wait!

A useful thing to know is that așteaptă can also be the 3rd person singular present form, meaning he/she waits or he/she is waiting. The form is the same, so the meaning depends on context.

In this sentence, since it is giving an instruction, the meaning is clearly imperative: Wait at least an hour.

It is informal singular, used when speaking to one person in a familiar way.

If you wanted the formal or plural version, you would say:

• Așteptați măcar o oră.

That can mean:

• Wait at least an hour when speaking politely to one person
• Wait at least an hour when speaking to more than one person

Romanian often omits subject pronouns when they are not needed, because the verb form already gives enough information.

So in Așteaptă, the command is understood as being addressed to you singular, even though tu is not stated.

You could add tu for emphasis, but normally you would not:

• Tu așteaptă măcar o oră sounds marked or emphatic, not neutral everyday speech.

In this sentence, măcar means at least.

So:

• măcar o oră = at least an hour

Depending on context, măcar can also have other shades of meaning, such as if only or even just, but here the meaning is straightforwardly at least.

A close alternative would be:

• Așteaptă cel puțin o oră.

That also means Wait at least an hour.

Because oră is a feminine noun in Romanian.

Romanian uses:

• un with masculine and neuter singular nouns
• o with feminine singular nouns

So:

• o oră = an hour / one hour

Other examples:

• o casă = a house
• o zi = a day
• un băiat = a boy
• un drum = a road

It can mean either, depending on context.

In Romanian, o is both:

• the feminine form of one
• the feminine singular indefinite article, equivalent to a/an

So o oră can be understood as:

• one hour
• an hour

In this sentence, English would most naturally say at least an hour, but at least one hour is also correct.

Because Romanian, like English, can express duration of time directly without a preposition after certain verbs.

So:

• Așteaptă o oră = Wait an hour
• Dorm două ore = I sleep for two hours
• Am stat acolo trei zile = I stayed there for three days

English sometimes uses for, but often leaves it out too. Romanian normally just uses the time expression directly in this kind of sentence.

A rough pronunciation guide is:

• Așteaptă ≈ uh-SHTEAP-tuh
• măcar ≈ muh-KAR
• o oră ≈ o OH-ruh

A few sounds that English speakers often need to notice:

• ș sounds like sh in ship
• ă is a short central vowel, something like the a in sofa
• ț would sound like ts, though it does not appear in this sentence

So the whole sentence is approximately:

• uh-SHTEAP-tuh muh-KAR o OH-ruh

The given word order is the most natural and neutral:

• Așteaptă măcar o oră.

Romanian word order is somewhat flexible, but changing it can shift the emphasis.

For example:

• Așteaptă o oră măcar.
  This is possible, but it sounds more like at least is being added as an afterthought or emphasized.

• Măcar o oră așteaptă.
  This is much more emphatic or marked, not the neutral everyday order.

So for a normal instruction, Așteaptă măcar o oră is the best choice.

Yes. That is a very natural alternative.

• măcar = at least
• cel puțin = at least

In this sentence, both work well:

• Așteaptă măcar o oră.
• Așteaptă cel puțin o oră.

Very roughly:

• măcar can sometimes feel a little more conversational or emotionally colored
• cel puțin can feel a bit more neutral or literal

But in many everyday situations, they are interchangeable.

For the singular informal negative imperative, you would say:

• Nu aștepta măcar o oră.

However, in real usage, that exact sentence is not very natural unless the context strongly calls for it.

More commonly, you might hear:

• Nu aștepta o oră întreagă. = Don’t wait a whole hour.
• Nu aștepta atât de mult. = Don’t wait that long.

A useful grammar point is that the negative singular imperative often looks like the infinitive without a:

• a aștepta → Nu aștepta!

For the formal/plural negative:

• Nu așteptați!