Ο δικαιούχος λογαριασμού και ο συνδικαιούχος ελέγχουν το IBAN.

Because both δικαιούχος and συνδικαιούχος are singular masculine nouns, and each one has its own definite article ο.

So:

• ο δικαιούχος = the beneficiary / account holder
• ο συνδικαιούχος = the co-beneficiary / joint holder

In Greek, when two singular nouns are joined by και (and), it is very common to repeat the article if both nouns are definite:

• ο Α και ο Β = the A and the B

This is more natural than using just one article here.

Δικαιούχος is a common formal Greek word meaning someone who has the right to something, or someone entitled to something.

Depending on context, it can mean:

• beneficiary
• entitled person
• holder
• account holder in banking contexts

In this sentence, because of λογαριασμού (of account), δικαιούχος λογαριασμού means something like:

• account holder
• beneficiary of the account

So the banking context determines the most natural English meaning.

Συνδικαιούχος means co-beneficiary or joint account holder.

It is built from:

• συν- = co- / jointly
• δικαιούχος = beneficiary / entitled person / holder

So συνδικαιούχος literally means someone who shares the right or ownership with another person.

This kind of prefix is common in Greek. The idea is very similar to English co- in words like co-owner.

Because λογαριασμού is in the genitive singular.

The base form is:

• ο λογαριασμός = the account

But after a noun like δικαιούχος, Greek often uses the genitive to show what someone is the holder/beneficiary of:

• δικαιούχος λογαριασμού = literally holder/beneficiary of account

So:

• λογαριασμός = nominative, dictionary form
• λογαριασμού = genitive, meaning of account

This is very common in Greek noun combinations.

Because Greek often leaves out the article in this kind of noun phrase, especially in formal or institutional language.

So:

• δικαιούχος λογαριασμού = account holder
• literally: holder of account

If you added the article, του λογαριασμού, it would mean of the account, referring to a specific account more explicitly.

Compare:

• δικαιούχος λογαριασμού = account holder / holder of an account
• δικαιούχος του λογαριασμού = holder/beneficiary of the account

Both are possible, but the article-less version is very natural in official or banking language.

Because the subject is plural in meaning:

• Ο δικαιούχος λογαριασμού και ο συνδικαιούχος
  = The account holder and the joint holder

Two people are doing the action, so the verb must be in the 3rd person plural.

The singular would be:

• ελέγχει = he/she checks

The plural is:

• ελέγχουν = they check

So Greek agrees with the combined subject just as English does.

Ελέγχουν is present tense, active voice, 3rd person plural of ελέγχω (to check / inspect / verify / control, depending on context).

Here it means:

• they check
• they verify

In a banking sentence, verify may sound more natural in English, but grammatically the Greek form is simply present tense.

Breakdown:

• ελέγχω = I check
• ελέγχεις = you check
• ελέγχει = he/she/it checks
• ελέγχουμε = we check
• ελέγχετε = you (plural) check
• ελέγχουν = they check

Because IBAN is treated as a neuter noun in Greek here, so it takes the neuter singular article το.

So:

• το IBAN = the IBAN

Greek often assigns grammatical gender to abbreviations and foreign terms. In this case, IBAN is commonly treated as neuter.

This is very normal in modern Greek, especially with technical, financial, and imported terms.

It is very normal Greek word order.

The sentence follows a straightforward pattern:

• subject: Ο δικαιούχος λογαριασμού και ο συνδικαιούχος
• verb: ελέγχουν
• object: το IBAN

So it is basically:

• The account holder and the joint holder check the IBAN.

Greek word order is more flexible than English, but this sentence uses a very standard, neutral order.

A rough pronunciation guide is:

• Ο δικαιούχος λογαριασμού και ο συνδικαιούχος ελέγχουν το IBAN
• o thee-keh-YOO-hos lo-ga-riaz-MOO keh o seen-thee-keh-YOO-hos e-LENG-hoon to EE-ban

A few notes:

• δικαιούχος has stress on -ού-
• λογαριασμού has stress on the last syllable -μού
• συνδικαιούχος also has stress on -ού-
• ελέγχουν has stress on ε-
• In Greek, και is usually pronounced ke in normal speech, not strongly like English kai

In meaning, it applies to both.

Even though λογαριασμού comes right after δικαιούχος, the sentence naturally means:

• the account holder and the joint account holder check the IBAN

Greek often avoids repeating a noun when it is understood from the context. So the full expanded idea would be something like:

• Ο δικαιούχος λογαριασμού και ο συνδικαιούχος λογαριασμού...

But that would sound repetitive. Greek, like English, often leaves the repeated part out.

Yes. Ελέγχω has a range of meanings depending on context, including:

• check
• inspect
• verify
• review
• sometimes control

In a banking context, verify the IBAN may sound more natural than check the IBAN, even though check is also correct.

So a natural translation could be:

• The account holder and the joint account holder verify the IBAN.

The exact English choice depends more on style and context than on Greek grammar.