Omnes 'Talassio!' iterum clamant.

Because Latin often uses an adjective by itself when the noun is understood.

• omnis = every, all
• omnes = all (people), everyone

In this sentence, omnes is standing on its own, so it means something like all the people or everyone.

It is nominative plural, because it is the subject of clamant.

Omnes is the nominative plural form of omnis.

Here it is being used substantivally, meaning the adjective is acting like a noun:

• omnes clamant = everyone shouts / all shout

Depending on context, omnes can be masculine or feminine plural, but when referring to a mixed group or people in general, Latin commonly uses the masculine form.

Because Latin verbs usually include the subject in the ending.

• clamo = I shout
• clamas = you shout
• clamat = he/she/it shouts
• clamant = they shout

So clamant already means they shout.
The word omnes is added to make clear who they are: everyone.

Clamant is present tense, so it means:

• they shout
• they are shouting

Latin present tense can cover both simple present and present progressive, depending on context.

Iterum means again or a second time.

So:

• clamant = they shout
• iterum clamant = they shout again

It modifies the action of shouting.

Latin word order is more flexible than English word order because the grammar is shown by endings more than by position.

So these would all mean basically the same thing:

• Omnes Talassio iterum clamant.
• Omnes iterum Talassio clamant.
• Iterum omnes Talassio clamant.

The placement can slightly affect emphasis, but not the basic meaning. Here, iterum naturally goes with clamant: they shout again.

Talassio is a traditional Roman wedding cry or exclamation. It is often associated with marriage celebrations.

So in this sentence, the people are shouting Talassio! as a set cry, not using it as an ordinary noun in the sentence.

That is why it is often left as Talassio! rather than translated word-for-word.

Because it is the exact word being shouted.

The idea is:

• They shout “Talassio!” again.

So Talassio is not functioning like the subject or object in an ordinary grammatical way. It is the content of the cry.

In English we usually use quotation marks for that, and many textbooks do the same when glossing Latin.

Not in the normal sense.

Sometimes in Latin, the content of speech or a cry can appear without fitting neatly into regular sentence grammar. Here Talassio! is best understood as a direct exclamation: the actual shout itself.

So it is better to think:

• They shout: “Talassio!”

rather than trying to force it into a standard object relationship.

Putting omnes first gives it emphasis.

So the sentence begins with the idea:

• Everyone...

That makes the scene feel collective right away: all the people join in the cry.

Latin often uses word order for emphasis rather than strict grammatical necessity.

Usually not in a narrow, literal sense unless the context specifically points to men.

In many sentences, omnes simply means:

• everyone
• all
• all the people

Even though the form is grammatically masculine plural, Latin commonly uses the masculine plural for mixed groups or for people in general.

Yes: it is quite natural and expressive.

• Omnes = the subject, placed first for emphasis
• Talassio! = the cry being shouted
• iterum = again
• clamant = the verb, placed at the end

Ending with the verb is very common in Latin prose. So the sentence has a very Latin feel:

• subject first
• important exclamation in the middle
• verb at the end

A more literal English version would be:

• Everyone shouts “Talassio!” again.

Or, keeping the Latin order a bit more closely:

• All “Talassio!” again shout.

That second version is not natural English, but it shows how Latin can arrange words differently while keeping the same meaning.