Ákvæðið er mikilvægt.

It is a very common Icelandic sentence pattern:

• Ákvæðið = the subject
• er = is
• mikilvægt = an adjective describing the subject

So the structure is:

subject + verb + predicate adjective

This is directly parallel to English The provision/clause is important.

The dictionary form is ákvæði.

That is a neuter noun. In this sentence, ákvæðið is the definite singular form, meaning the provision / the clause / the decision, depending on context.

A useful way to think of it is:

• ákvæði = a provision / clause
• ákvæðið = the provision / the clause

The ending -ið is the definite article attached to the noun.

In Icelandic, the is usually not a separate word as it is in English. Instead, it is often added to the end of the noun.

So:

• ákvæði = provision / clause
• ákvæðið = the provision / the clause

This is very normal in Icelandic.

Because Icelandic usually expresses the by attaching it to the noun itself.

So instead of:

• English: the clause

you often get:

• Icelandic: ákvæðið

This is one of the first big differences English speakers notice. Icelandic does also have separate demonstrative-type words, but for ordinary the, the suffixed article is the normal choice.

It is in the nominative singular.

That is because it is the subject of the sentence, and subjects are typically in the nominative case.

So in:

• Ákvæðið er mikilvægt

Ákvæðið is the thing being talked about, so nominative makes sense.

Because the adjective has to agree with the noun it describes.

The noun ákvæði is:

• neuter
• singular
• here, nominative

So the adjective also appears in the neuter singular form:

• masculine: mikilvægur
• feminine: mikilvæg
• neuter: mikilvægt

Since ákvæðið is neuter, you get:

• Ákvæðið er mikilvægt

not mikilvægur or mikilvæg.

Because it is still describing the noun.

In this sentence, mikilvægt is a predicate adjective: it comes after er and tells us something about the subject. In Icelandic, predicate adjectives still agree with the noun in gender and number.

So even though it is not directly in front of the noun, it still matches ákvæðið:

• ákvæðið = neuter singular
• mikilvægt = neuter singular

Er is the 3rd person singular present tense of the verb vera (to be).

So:

• ég er = I am
• þú ert = you are
• hann / hún / það er = he / she / it is

In this sentence, the subject is singular, so er is the correct form.

Yes. This is the most neutral and natural word order for a simple statement:

• Ákvæðið er mikilvægt.

That is straightforward subject + verb + complement word order.

Icelandic does allow other word orders in some contexts, especially for emphasis or in questions, but this sentence is perfectly standard and neutral.

You would need a different structure, because now the adjective comes before the noun and directly modifies it.

That would be:

• mikilvægt ákvæði = an important provision/clause

Notice that the adjective is still neuter singular, so it stays mikilvægt.

Compare:

• mikilvægt ákvæði = an important provision
• ákvæðið er mikilvægt = the provision is important

Same adjective form here, but the sentence structure is different.

That would usually be:

• mikilvæga ákvæðið

Here the adjective changes form because it is now used with a definite noun.

So compare:

• mikilvægt ákvæði = an important provision
• mikilvæga ákvæðið = the important provision
• ákvæðið er mikilvægt = the provision is important

This difference is very important in Icelandic: adjectives can change depending on whether the noun is indefinite or definite.

A rough guide for an English speaker is:

• Á is pronounced like ow in now, but longer
• kv is pronounced much like kv
• æ sounds somewhat like eye
• ðið contains ð, a soft sound like th in this

A very rough approximation might be:

• OW-kvai-thith

But that is only approximate. The real Icelandic pronunciation is more precise than English spelling can show.

Also remember:

• the first syllable is stressed: Ákvæðið

A rough approximation is something like:

• MIH-kil-vyght

A few points:

• stress is on the first syllable: MIkilvægt
• æ does not sound exactly like any single English vowel
• the final -gt cluster may sound less fully pronounced than an English speaker expects

As often happens in Icelandic, the spelling is helpful, but the exact sound takes listening practice.

It is capitalized simply because it is the first word of the sentence.

Icelandic does not capitalize all nouns the way German does.

So if the word appeared in the middle of a sentence, it would normally be:

• ákvæðið

not capitalized unless there were some special reason.

Yes. Depending on context, ákvæði can be translated in several ways, such as:

• provision
• clause
• sometimes decision or a more specialized legal/administrative term

That is very normal when learning Icelandic: one Icelandic word may match several English words depending on context.

So even if the meaning has already been given to you, it is good to remember that the grammar of the sentence stays the same regardless of which English translation fits best.