Η εμπορική αξία είναι μεγάλη.

A word-by-word breakdown is:

• Η = the (feminine singular definite article)
• εμπορική = commercial / market-related
• αξία = value
• είναι = is
• μεγάλη = big / great / large

So grammatically, Η εμπορική αξία is the subject, είναι is the verb, and μεγάλη is the adjective describing the subject.

Η is the feminine singular form of the.

Greek definite articles change for gender, number, and case, so Greek does not use just one word for the in every situation.

Here, αξία is:

• feminine
• singular
• nominative (the subject of the sentence)

So the correct article is η.

Because they both describe αξία, and αξία is a feminine singular noun.

In Greek, adjectives must agree with the noun they describe in:

• gender
• number
• case

So:

• αξία = feminine singular
• εμπορική = feminine singular
• μεγάλη = feminine singular

If the noun were masculine or neuter, the adjective forms would change too.

Because in Greek, as in English, many adjectives commonly come before the noun.

So:

• εμπορική αξία = commercial value / market value

This is the normal order. Greek does allow some flexibility, but adjective + noun is very common and natural here.

Yes. εμπορική comes from εμπορικός / εμπορική / εμπορικό, meaning commercial or trade-related.

It is related to:

• εμπόριο = trade / commerce

So εμπορική αξία means something like:

• commercial value
• market value

Depending on context, market value is often the most natural English translation.

είναι is the present tense of to be and means is here.

In Modern Greek, the verb to be is normally not omitted in a sentence like this. So unlike some languages, you usually do need είναι in standard sentences of this type.

So:

• Η εμπορική αξία είναι μεγάλη. = correct
• Leaving out είναι would usually sound incomplete or non-standard in ordinary prose.

The main noun phrase Η εμπορική αξία is in the nominative because it is the subject of the sentence.

Also, μεγάλη is in the nominative feminine singular because it is a predicate adjective describing the subject after είναι.

So the key forms are all nominative feminine singular:

• η
• εμπορική
• αξία
• μεγάλη

Literally, yes, μεγάλη means big, large, or great.

But in a sentence about value, English often uses a more natural expression such as:

• high
• great
• considerable

So while the Greek word is literally big/large, the meaning in context is more like the commercial value is high/considerable.

Yes, Greek word order is more flexible than English word order.

The neutral, straightforward order is:

• Η εμπορική αξία είναι μεγάλη.

But other orders are possible for emphasis, for example:

• Μεγάλη είναι η εμπορική αξία.

This can sound more emphatic, like It is the commercial value that is great/high.

So the original sentence is the most neutral and standard version.

A rough pronunciation guide is:

• Η = ee
• εμπορική = em-po-ri-KEE
• αξία = ax-EE-a
• είναι = EE-ne
• μεγάλη = me-GHA-lee

A full rough reading:

• ee em-po-ri-KEE ax-EE-a EE-ne me-GHA-lee

A few notes:

• The stress marks show which syllable is stressed.
• γ before ά in μεγάλη is a soft Greek g sound, not exactly like English g.

Modern Greek normally writes a stress mark on polysyllabic words to show which syllable is stressed.

So:

• εμπορική
• αξία
• είναι
• μεγάλη

all show the stressed syllable.

The article η does not need a stress mark because it is only one syllable.

These accents are an important part of normal spelling in Greek.

Yes, it is a very common collocation.

εμπορική αξία is a standard way to say:

• commercial value
• market value

You might see it in contexts like:

• business
• economics
• property
• products
• legal or financial documents

So it is not just any adjective + noun combination; it is also a very natural fixed expression.

No. Greek does not have a separate indefinite article equivalent to English a/an.

So Greek can say simply:

• εμπορική αξία = commercial value / a commercial value, depending on context

In this sentence, the noun phrase is definite because it has η:

• Η εμπορική αξία = the commercial value

So Greek marks definiteness with the definite article, but it does not use a separate word for a/an.