Ο εξοπλισμός είναι καινούριος.

Because εξοπλισμός is a masculine noun in Greek.

Greek nouns have grammatical gender, and the definite article must match the noun’s gender, number, and case.

• ο = masculine singular nominative
• η = feminine singular nominative
• το = neuter singular nominative

So:

• ο εξοπλισμός = the equipment

Even though equipment is not biologically male, Greek grammatical gender is not the same as natural gender.

It is nominative singular.

In this sentence, εξοπλισμός is the subject, so it appears in the nominative case:

• Ο εξοπλισμός = the equipment
• είναι = is
• καινούριος = new

So the basic structure is:

subject + verb + adjective

Because it must agree with εξοπλισμός.

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

• gender
• number
• case

Since εξοπλισμός is:

• masculine
• singular
• nominative

the adjective also appears as:

• καινούριος

Compare:

• ο εξοπλισμός είναι καινούριος = the equipment is new
• η τσάντα είναι καινούρια = the bag is new
• το αυτοκίνητο είναι καινούριο = the car is new

είναι is the present tense form of είμαι, meaning to be.

Here it means is.

A useful thing to know is that είναι is used for both:

• he/she/it is
• they are

So Greek does not have separate present-tense forms like English is and are in this case.

Examples:

• ο εξοπλισμός είναι καινούριος = the equipment is new
• τα παπούτσια είναι καινούρια = the shoes are new

Greek does have an indefinite article, but it is not used in the same way as English in every context.

Here the sentence uses the definite article:

• ο εξοπλισμός = the equipment

If you wanted an equipment, that would already sound unusual in English, and similarly Greek normally treats εξοπλισμός as a general or collective noun.

So in practice, ο εξοπλισμός is the natural way to say the equipment.

Also, Greek often uses the definite article more regularly than English does with nouns.

It is singular, even though its meaning can refer to a collection of things.

This is similar to English equipment, which is also usually treated as an uncountable or collective noun:

• The equipment is new not normally
• The equipment are new

Greek εξοπλισμός works similarly here:

• Ο εξοπλισμός είναι καινούριος

If you want to talk about individual pieces of equipment, Greek would usually use different wording, depending on the context.

Yes, you probably could, but καινούριος is often the more natural word for new in the sense of brand-new / recently bought / not old / not used before.

Very roughly:

• καινούριος = new, brand-new
• νέος = new, but also young, recent, modern, or new in contrast to old/former

So:

• Ο εξοπλισμός είναι καινούριος strongly suggests the equipment is new in condition.
• Ο εξοπλισμός είναι νέος can work, but depending on context it may sound a bit less specific or slightly different in nuance.

For many learners, καινούριος is the safest choice when talking about objects being new.

That would usually sound unnatural in standard Greek.

Greek uses articles more often than English, especially with ordinary nouns used as subjects. So:

• Ο εξοπλισμός είναι καινούριος = natural
• Εξοπλισμός είναι καινούριος = generally not the normal choice

If you drop the article, the sentence may sound incomplete, unnatural, or only work in very special contexts.

For a learner, it is best to keep the article here.

Yes. Greek word order is more flexible than English because endings show grammatical relationships.

The neutral, straightforward order is:

• Ο εξοπλισμός είναι καινούριος.

But you might also hear:

• Καινούριος είναι ο εξοπλισμός.

That version gives more emphasis to καινούριος.

So the normal advice is:

• use Ο εξοπλισμός είναι καινούριος as your default
• learn alternative word orders later for emphasis and style

A simple approximate pronunciation is:

o exoplizmÓS Íne kenÚrios

A few helpful notes:

• ο sounds like o in for for many learners, but shorter
• ξ = ks
• σμ in εξοπλισμός is pronounced together smoothly
• είναι is pronounced roughly EE-ne
• και in καινούριος sounds like ke
• the accented syllables are:
  • εξοπλισμός
  • είναι
  • καινούριος

The stress marks are important in Greek pronunciation.

Greek uses an accent mark to show which syllable is stressed.

So:

• είναι is stressed on the first syllable
• καινούριος is stressed on νού
• εξοπλισμός is stressed on the last syllable

Stress can matter a lot in Greek, because it is a normal part of correct pronunciation and sometimes helps distinguish forms.

When learning vocabulary, it is best to memorize each word together with its stress:

• εξοπλισμός
• είναι
• καινούριος

It is a predicate adjective.

That means it comes after the verb είναι and describes the subject:

• Ο εξοπλισμός είναι καινούριος.
• literally: The equipment is new.

This is different from an adjective placed directly before or after a noun inside a noun phrase, such as:

• ο καινούριος εξοπλισμός = the new equipment

So Greek can express the same idea in two ways:

• Ο εξοπλισμός είναι καινούριος = the equipment is new
• ο καινούριος εξοπλισμός = the new equipment

The dictionary form is usually given in the masculine singular nominative:

• καινούριος

But the adjective has different forms depending on gender and number, for example:

• masculine: καινούριος
• feminine: καινούρια
• neuter: καινούριο

So if you see καινούριος in a dictionary, that does not mean it is always used in that exact form. It changes to match the noun.