El señor espera aquí.

• El = the definite article, the
• señor = a noun meaning man, gentleman, or sir/Mr. depending on context
• espera = the verb, present tense, third-person singular of esperar
• aquí = an adverb meaning here

So the structure is:

• El señor = the subject
• espera = the verb
• aquí = tells you where the action happens

In Spanish, el and él are different words:

• el = the
• él = he

In this sentence, el is an article going with señor, so it has no accent: el señor = the man / the gentleman / the sir

The accented form él would be a pronoun, as in Él espera aquí = He waits here.

The tricky part is ñ.

• señor is pronounced roughly like sen-YOR
• The ñ sounds like the ny in canyon

So it is seh-NYOR, not seh-nor.

Also:

• se sounds like seh
• Stress falls on the second syllable: seÑOR

Espera is the present tense form of esperar for:

• he
• she
• it
• you (formal singular, usted)

So by itself, espera could mean:

• he waits
• she waits
• it waits
• you wait (formal)

In this sentence, the subject is El señor, so it means the man/gentleman waits.

Yes. Esperar can mean:

• to wait
• to hope
• sometimes to expect, depending on context

In El señor espera aquí, the presence of aquí makes waits here the natural meaning.

Examples:

• Espero aquí. = I wait here.
• Espero que venga. = I hope he/she comes.

So context is what tells you which meaning is intended.

Spanish often does not need subject pronouns because the verb ending already gives information about the subject.

Here, though, the subject is stated as a noun phrase:

• El señor espera aquí

You do not need to add él because el señor already tells you who is doing the action.

Spanish normally would not say:

• Él el señor espera aquí

That would be wrong.

You could say:

• Él espera aquí = He waits here

But once you say el señor, the pronoun is unnecessary.

This is the most neutral Spanish word order:

• subject + verb + place

So:

• El señor = subject
• espera = verb
• aquí = place

Spanish word order is more flexible than English, so you could also hear:

• Aquí espera el señor
• El señor aquí espera (less common, more marked)

But El señor espera aquí is the plain, standard order.

Aquí has a written accent because Spanish spelling rules require it.

The stress falls on the last syllable:

• a-QUÍ

Words ending in a vowel, n, or s normally stress the second-to-last syllable unless there is an accent mark. Since aquí is stressed on the last syllable, it needs the accent.

The accent mark here is mainly for:

• showing the correct stress
• distinguishing the pronunciation clearly

It is pronounced roughly ah-KEE.

A few details:

• a = like a in father
• qu before i sounds like k
• stress is on quí

So:

• aquí = ah-KEE

The u in qu is silent here.

It can mean different things depending on context.

Common uses of señor:

• Mr. before a name: el señor García
• sir in polite address
• gentleman or man in some contexts

In El señor espera aquí, without a name, it often sounds like:

• The gentleman waits here
• The man is waiting here
• sometimes The gentleman waits here

The exact English choice depends on the situation.

Yes. That is also correct.

There is a small difference:

• El señor espera aquí = simple present; often a general or neutral statement
• El señor está esperando aquí = emphasizes that he is in the process of waiting right now

In many everyday situations, both can translate naturally as The man is waiting here.

Spanish uses the simple present more often than English does, so espera can sometimes correspond to English is waiting.

It is fairly neutral and can sound polite because of señor.

• señor is more respectful than just saying hombre for man
• The sentence itself is simple and standard

So yes, it can sound polite or formal depending on context, especially if you are referring respectfully to an older man, a customer, or someone you do not know well.

In Spain, aquí is the normal choice for here.

Acá exists, but it is much more common in many Latin American varieties than in standard everyday Spain Spanish.

So for a learner focusing on Spain Spanish, aquí is the safest and most natural word to use here.