1. one-off - Noun
2. one-off - Adjective
a happening that occurs only once and is not repeated
Source: WordNetone off
When something's made in the smallest volume - as a one-off couture piece - or in large quantities, deep care is critical to determine authentic, successful design and, ultimately, manufacture. Jonathan Ive
I like a little bit of designer, with a bit of vintage and high street mixed in. I love it when you find those one-off key pieces, which end up becoming investment pieces. Cara Delevingne
I've always known my dad is a one-off and his own person. But I feel that underneath he has always loved me. Alfie Allen
I think Douglas was a real one-off. He was so clever and so intelligent and so well read in real science that he could make science fiction work as well as it did. And just such fun to have around, he was just such a lovely man. Lalla Ward
We do long-form-style improv. Our focus was characters and telling a long arc story over about an hour and a half. It was closer to a one-act play than one-off sketches. Tatiana Maslany
$2 billion build numerous schools and life-saving clinics, but redistributed would be a one-off $70 for each Angolan – nice, but not really life changing. Source: Internet