Bókunarstaðfestingin kom í dag.

It is a compound noun made of:

• bókun = booking, reservation
• staðfesting = confirmation
• -in = the definite article the

So the core idea is booking-confirmation-the = the booking confirmation.

More precisely, the first part appears as bókunar-, not just bókun, because Icelandic very often uses a genitive form inside compounds. That gives the sense of confirmation of a booking.

So:

• bókunarstaðfesting = booking confirmation
• bókunarstaðfestingin = the booking confirmation

Because Icelandic usually puts the definite article onto the noun itself, instead of using a separate word like English the.

Here:

• bókunarstaðfesting = booking confirmation
• bókunarstaðfestingin = the booking confirmation

This is very common in Icelandic. So instead of a separate article before the noun, you often see a suffix attached to the end.

That -ar is a genitive ending. In many Icelandic compounds, the first noun appears in the genitive, especially when the meaning is something like X of Y.

So:

• bókun = booking
• bókunar- = of a booking / booking-related

That is why bókunarstaðfesting literally feels like confirmation of booking.

This is a very normal pattern in Icelandic word formation, so learners will see it a lot in longer nouns.

Kom is the past tense of koma, which means to come.

In this sentence, kom means came.

Some useful forms are:

• koma = to come
• kemur = comes / is coming
• kom = came

So Bókunarstaðfestingin kom í dag uses the simple past: The booking confirmation came today.

Because Icelandic verbs in the past tense often do not distinguish between he, she, and it in the singular.

Here the subject is bókunarstaðfestingin, which is a singular noun, so the verb is the singular past form kom.

That same form can be used with many singular subjects:

• hann kom = he came
• hún kom = she came
• það kom = it came
• bókunarstaðfestingin kom = the booking confirmation came

So the verb agrees mainly in number here, not in gender.

It is in the nominative singular definite.

Why nominative? Because it is the subject of the sentence — the thing that came.

A rough breakdown is:

• base noun: staðfesting
• compound: bókunarstaðfesting
• definite nominative singular: bókunarstaðfestingin

If you are learning cases, this is a good example of a straightforward subject in the nominative.

Í dag is a very common expression meaning today.

Literally, í often means in, and dag is related to day, so the phrase originally feels like in the day / today. But for learners, it is best to treat í dag as a fixed everyday expression meaning simply today.

You will see similar time expressions in Icelandic, and they often do not translate word-for-word in a natural way.

Because after the preposition í in this expression, the noun appears in a different case form.

The basic dictionary form is:

• dagur = day

But in í dag, it becomes dag.

So this is a good reminder that Icelandic nouns change form depending on grammar, especially after prepositions.

For this sentence, the most useful thing is just to recognize í dag as a set phrase meaning today.

Yes. This is a very normal Icelandic sentence pattern:

• Bókunarstaðfestingin = subject
• kom = verb
• í dag = time expression

So the order is basically:

Subject + Verb + Time

That is completely natural in Icelandic.

You could also move í dag to the front for emphasis, but then Icelandic word order would shift accordingly, because Icelandic follows a verb-second pattern in main clauses.

The head noun staðfesting is feminine, and the whole compound follows the gender of its head noun. So bókunarstaðfesting is also feminine.

That matters because gender affects:

• the form of the definite article
• adjective agreement
• some case endings

So although the sentence does not have an adjective in it, it is still useful to know that this noun is feminine.

A rough English-friendly guide would be something like:

BOH-ku-nar-stath-fes-ti-ting-in kom ee dahg

A few notes:

• ó is a long vowel, roughly like oh
• ð is like the th in this
• í is like ee
• g at the end of dag is not always pronounced exactly like English g, so it may sound softer depending on speaker and context

The long compound looks intimidating, but Icelandic compounds are very normal. With practice, learners start recognizing the parts rather than seeing it as one impossible word.