Akademik

one-off
noun
a happening that occurs only once and is not repeated
Hypernyms: ↑happening, ↑occurrence, ↑occurrent, ↑natural event

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one-off «WUHN AWF, -OF», adjective, noun. British.
–adj.
made or intended for only one time, occasion, or person: »

These relationships involve money and are on a continuing basis rather than a one-off purchase (London Times).

–n.
anything made or intended for one time, occasion, or person; something special.

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1.
informal, chiefly Brit. adj. done, made, or happening only once and not repeated

one-off tax deductible donations to charity

2.
n. something done, made, or happening only once, not as part of a regular sequence

the meeting is a one-off

a person who is unusual or unique, esp. in an admirable way

he's a one-off, no one else has his skills

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/ˌwʌnˈɑːf/ adj, always used before a noun
chiefly Brit : done or happening only once

one-off gigs/events

a one-off cost/payment

one-off noun, pl -offs [count]

The event is a one-off.

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ˌone-ˈoff [one-off one-offs] adjective, noun
adjective (BrE) (NAmE ˈone-shot) only before noun
made or happening only once and not regularly

a one-off payment

 
noun (BrE)
a thing that is made or that happens only once and not regularly

It was just a one-off; it won't happen again.

 
See also:one-shot

Useful english dictionary. 2012.