Sexta via longa est.

Because sexta is an adjective meaning sixth, and it has to agree with via.

Here, via is:

• feminine
• singular
• nominative

So sexta must also be:

• feminine
• singular
• nominative

That is why you get sexta via, not sextus via or sextum via.

Sex means six and is a cardinal number.

Sexta means sixth and is an ordinal number.

So:

• sex viae = six roads
• sexta via = the sixth road

English uses both kinds too:

• six roads
• the sixth road

Via is in the nominative singular here.

You can tell from the sentence structure:

• via is the subject
• est means is
• longa describes the subject

So the basic pattern is:

subject + linking verb + adjective

That means both via and longa are nominative, and sexta matches via because it modifies it.

For the same reason as sexta: it agrees with via.

Longa means long, and it describes via. Since via is feminine singular nominative, longa must also be feminine singular nominative.

So all three words match in form where needed:

• sexta = feminine singular nominative
• via = feminine singular nominative
• longa = feminine singular nominative

Est is the third-person singular present form of esse, meaning to be.

So est means is.

It links the subject sexta via with the description longa:

• Sexta via = the sixth road
• longa est = is long

This is called a linking verb or copula.

Sometimes, yes. Latin can omit forms of to be, especially in poetry, informal style, or when the meaning is obvious from context.

So Sexta via longa could be understood as The sixth road is long.

However, in standard textbook prose, est is often included, and that is the clearest full sentence.

Latin does not have definite or indefinite articles like English the or a/an.

So via can mean:

• a road
• the road

And sexta via can mean:

• a sixth road
• the sixth road

The exact English translation depends on context. Very often, with an ordinal like sixth, English naturally uses the, even though Latin does not actually have a separate word for it.

Yes. Latin word order is much more flexible than English word order because the endings show how words relate to one another.

All of these could mean the same thing:

• Sexta via longa est
• Via sexta longa est
• Longa est sexta via
• Sexta longa via est

The most natural order depends on emphasis and style. The given sentence is perfectly normal and easy to understand.

Here longa is a predicate adjective, not just a regular adjective placed next to the noun.

Compare:

• longa via = a long road
  Here the adjective directly modifies the noun.

• via longa est = the road is long
  Here the adjective is linked to the noun by est.

In Sexta via longa est, sexta directly modifies via, while longa is the predicate adjective describing what the road is like.

In a basic classroom pronunciation, you could say it roughly like:

SEKS-tah WEE-ah LON-gah est

A few notes:

• x sounds like ks
• v in restored Classical pronunciation sounds like English w
• i in via sounds like ee
• g in longa is always hard, as in go

So in Classical-style pronunciation:

• Sexta ≈ SEKS-ta
• via ≈ WEE-a
• longa ≈ LON-ga
• est ≈ est

Via is a first-declension noun.

Its nominative singular form ends in -a, which is very common for first-declension nouns. It is also feminine, as most first-declension nouns are.

A few useful forms are:

• via = nominative singular
• viae = genitive singular / dative singular / nominative plural
• viam = accusative singular
• viā = ablative singular

In this sentence, the form is via, so it is nominative singular.

Yes. Both are first-and-second-declension adjectives.

That means they change endings to match the noun they describe:

• feminine nominative singular: -a
• masculine nominative singular: -us
• neuter nominative singular: -um

So:

• sexta via
• sextus puer
• sextum oppidum

And likewise:

• longa via
• longus puer
• longum oppidum

That is why both adjectives appear in -a here.