''one-of-a-kind" in Spanish

Question

i am aware this has been asked of before but each response has a different answer

is it (i'm aware they mean different things but the gist is the same):

• fuera de serie
• uno en un million
• único

or is it something completely different.

Thank-you in advance for the help. apologies if my English is bad, i am just learning English too.

Answer 1

You're close, we say único en su clase to mean the same as "one of a kind".

Or "única.." if its female. - diagonx, Oct 23, 2012

Answer 2

"Único" by itself means "unique" or "one-of-a-kind". This may be the word you're looking for. And your English is quite good! Keep up the good work!