Now that we have talked about uno, here's another related word that's handy to know. It's a word you can guess one meaning of because it looks similar to an English word you know.
Oggi Matera è un sito unico al mondo...
Today, Matera is a site that's unique in the world...
Caption 46, Alberto Angela - Meraviglie EP. 1 - Part 11Play Caption
So when you want to say something is unique, now you know how. Don't forget that the adjective unico has to agree with its noun. You have 4 possible endings to choose from: unico, unica, unici, uniche.
One way Italians like to use unico is to give someone a certain kind of compliment (which can be ironic, too).
Augusto, sei unico.
Augusto, you're one of a kind.
Caption 34, La Ladra Ep. 6 - Nero di rabbia - Part 6Play Caption
Again, if you are saying this to a girl or woman, you will want to use unica.
Maria, sei unica!
Maria, you're special!
But the main way Italians use the word unico is to mean "only."
È l'unico modo che ho per sdebitarmi.
It's the only way I have to settle my debt.
Caption 25, La Ladra EP. 8 - Il momento giusto - Part 6Play Caption
Questa scuola è l'unica cosa che ho.
This school is the only thing I have.Play Caption
E saremo gli unici al mondo ad avere qualcosa di simile.
And we'll be the only ones in the world to have something like this.Play Caption
Tutte le volte che veniva a pregare per le uniche persone che amava.
Every time she came to pray for the only people she loved.Play Caption
If you travel to Italy and go clothes shopping, here's something you will definitely see on the racks or on a label.
taglia unica (one size fits all).
The noun La taglia comes from the verb tagliare (to cut).
The other very important expression with unico is what you might see while driving your macchina a noleggio (rental car).
una strada a senso unico (a one way street)
People also just call a one way street:
un senso unico (a one way street)
In these last two examples, we could say that unico stands for "one." The important thing is to understand what it means in the situation. You don't want to drive the wrong way down a road!