Iactus par est.

• iactus is a noun
• par is an adjective
• est is a verb

More specifically:

• iactus = nominative singular masculine
• par = nominative singular, agreeing with iactus
• est = he/she/it is, the 3rd person singular present tense of sum

So the basic structure is:

• subject: iactus
• predicate adjective: par
• linking verb: est

This is the Latin equivalent of a sentence like The throw is even or The cast is even.

Because it is in the nominative case, which is the case normally used for the subject of a sentence.

In a sentence with est and an adjective, Latin commonly has:

• a nominative subject
• a predicate adjective that also appears in the nominative and agrees with the subject

So in Iactus par est:

• iactus = the thing being described
• par = the description
• est = links them

That is why iactus is understood as the subject.

Because adjectives in Latin do not all use the same endings.

Par belongs to a different adjective pattern from adjectives like bonus, bona, bonum.

It is a third-declension adjective, and its nominative singular form is simply par. Even though it does not look like iactus, it still agrees with it in the important grammatical categories:

• case: nominative
• number: singular
• gender: masculine here

So agreement in Latin does not mean the adjective has to look exactly like the noun. It means it must match grammatically.

Par is a third-declension adjective, and it means something like equal, even, or level, depending on context.

Its dictionary form is usually given as:

• par, paris

That second form, paris, shows it belongs to the third declension.

This is why it does not behave like a first-and-second-declension adjective such as magnus or bonus.

Not necessarily. A noun ending in -us is often second declension, but not always.

Iactus is actually a fourth-declension noun.

That is a very common point of confusion for English-speaking learners, because both second- and fourth-declension masculine nouns can have -us in the nominative singular.

So you have to learn the noun’s dictionary entry, not just guess from the ending.

For iactus, the form here is nominative singular.

Because Latin has no articles.

Latin does not have separate words that directly mean the or a/an.

So iactus can mean:

• a throw
• the throw

and context tells you which is best in translation.

This is very normal in Latin, and you should not expect every noun to have an article.

Because Latin word order is much more flexible than English word order.

English strongly prefers:

• The throw is even

Latin can place the verb in different positions, and putting the verb at the end is very common:

• Iactus par est

This often feels natural and unremarkable in Latin.

You might also see:

• Par iactus est
• Iactus est par

Those are grammatically possible, but they may give slightly different emphasis.

So the ending position of est is not strange in Latin at all.

Yes, often they could.

Because Latin shows grammatical relationships through endings more than through word order, these can all be grammatical:

• Iactus par est
• Par iactus est
• Iactus est par

The core meaning stays the same, though the emphasis may shift.

For example:

• putting par first can emphasize even
• putting est in the middle can sound a little different in rhythm or focus

An English speaker has to get used to the fact that Latin word order is often about style and emphasis, not just grammar.

Here it is best understood as an adjective.

Latin par can sometimes function as a noun, meaning something like equal or match, but in this sentence it is describing iactus through the linking verb est.

So the pattern is:

• noun + adjective + est

That strongly points to par being a predicate adjective: it tells you what kind of throw it is.

Because after a linking verb like est, a predicate adjective agrees with the subject.

In English we do this too, but we usually do not notice it because English has fewer visible endings:

• The throw is even

In Latin, the adjective linked to the subject by est usually appears in the nominative case and agrees with the subject.

So:

• iactus = nominative singular
• par = nominative singular

This is exactly what you would expect in a sentence of this type.

Est is from sum, esse, meaning to be.

It is:

• present tense
• indicative mood
• active voice in the usual way Latin describes sum
• 3rd person singular

So est means:

• is

Because iactus is singular, the verb is singular too.

If the subject were plural, you would expect sunt instead.