Nitakuona nyumbani jioni.

Because Swahili verbs often pack several pieces of meaning into a single word.

Ni-ta-ku-on-a breaks down like this:

• ni- = I
• -ta- = future tense
• -ku- = you (singular object)
• -on- = see
• -a = the final vowel of the verb

So Nitakuona literally builds the meaning I-will-you-see = I will see you.

It is not a separate word. In Swahili, future tense is shown by the marker -ta- inside the verb.

So:

• ninaona = I see / I am seeing
• nitaona = I will see
• nitakuona = I will see you

This is very normal in Swahili: tense is usually built into the verb.

Swahili commonly uses an object marker inside the verb. In this sentence, -ku- means you.

That means you do not need a separate word for you unless you want extra emphasis.

• Nitakuona = I will see you
• Nitakuona wewe = I will see you (with extra emphasis on you)

Here, -ku- normally refers to one person. If you mean you all, Swahili often uses -wa-, and speakers may add ninyi if they want to make that clear.

Nyumbani comes from nyumba = house / home plus the locative ending -ni.

So:

• nyumba = house, home
• nyumbani = at home, in the house, to the house/home

In this sentence, the natural meaning is at home.

The ending -ni is very common in Swahili for places and locations.

By itself, nyumbani usually just means home / at home, and the exact home is understood from context.

If you want to be specific, Swahili can do that:

• kwangu = at my place
• kwako = at your place
• kwake = at his/her place

So Nitakuona nyumbani jioni leaves the exact home unspecified unless the situation already makes it obvious.

Because Swahili often uses time words directly, without extra words like in, on, or the.

So jioni can naturally mean:

• in the evening
• this evening
• evening time

The exact English translation depends on context. This is very normal Swahili usage.

No, Swahili word order is fairly flexible, although this sentence has a very natural neutral order:

Nitakuona nyumbani jioni
= I will see you at home in the evening

You could also say:

• Jioni nitakuona nyumbani = In the evening, I will see you at home
• Nyumbani nitakuona jioni = At home, I will see you in the evening

Changing the order usually changes focus or emphasis, not the basic meaning.

Yes, it is grammatical and natural if you mean the full idea I will see you at home this evening.

But as a goodbye phrase, Swahili often prefers a more mutual form:

Tutaonana nyumbani jioni
= We will see each other at home this evening

That often sounds closer to English See you at home this evening.

So:

• Nitakuona... = I will see you...
• Tutaonana... = See you... / We’ll see each other...

A helpful syllable breakdown is:

Ni-ta-ku-o-na nyum-ba-ni ji-o-ni

A few pronunciation notes:

• Every vowel is pronounced clearly.
• j sounds like English j in jam.
• ny sounds like the ny in canyon.

Swahili usually stresses the second-to-last syllable of each word:

• ni-ta-ku-O-na
• nyum-BA-ni
• ji-O-ni

Yes. Swahili often leaves out details that are already clear from context.

For example:

• Nitakuona = I will see you
• Nitakuona jioni = I will see you in the evening
• Nitakuona nyumbani = I will see you at home

The full sentence simply adds both the place and the time.