one-off
Not happening again
A one-off is something made or done only once, not part of a series or regular production: The concert was a one-off, not the start of a tour.
As an adjective, it describes unique or non-repeating events, items, or arrangements: a one-off payment, a one-off collaboration.
More common in British than American English, where one-time often substitutes.
Only one exists
- isolatedSeparated from others
- standaloneComplete without attachments
- nonrecurringOccurring only once
- unrepeatedHappening only once
discrete · separate · distinct · individual · solitary · independent · self-contained · unconnected
Made to individual specifications
- handcraftedMade manually, not machined
- tailoredAdjusted to fit exactly
- artisanalMade by skilled craftspeople
- commissionedFormally assigned a task
made-to-order · custom-built · personalized · handmade · crafted · custom · exclusive · individualized
Departure from the expected
- infrequentHappening only occasionally
- occasionalHappening at intervals
- sporadicOccurring irregularly, infrequently
- uncommonSeldom occurring or found
irregular · aberration · intermittent · episodic · unusual · atypical · outlier · oddity
Live musical performance
- galaFestive formal occasion
- performanceCarrying out a task
- premiereFirst public performance
- benefitAdvantage or gain
showing · screening · engagement · appearance · booking · gig · production · commission
Lasting very briefly
- momentaryLasting very briefly
- fleetingPassing very quickly
- transientTemporary, soon departing
- impermanentNot meant to last
short-lived · passing · brief · temporary · disposable · throwaway · stopgap · interim
unique
Only one exists
- isolatedSeparated from others
- standaloneComplete without attachments
- nonrecurringOccurring only once
unrepeated · discrete · separate · distinct · individual · solitary · independent · self-contained · unconnected · detached
bespoke
Made to individual specifications
- handcraftedMade manually, not machined
- tailoredAdjusted to fit exactly
- artisanalMade by skilled craftspeople
commissioned · made-to-order · custom-built · personalized · handmade · crafted · custom · exclusive · individualized · one-of-a-kind
anomaly
Departure from the expected
- infrequentHappening only occasionally
- occasionalHappening at intervals
- sporadicOccurring irregularly, infrequently
uncommon · irregular · aberration · intermittent · episodic · unusual · atypical · outlier · oddity · rarity
concert
Live musical performance
- galaFestive formal occasion
- performanceCarrying out a task
- premiereFirst public performance
benefit · showing · screening · engagement · appearance · booking · gig · production · commission · special
ephemeral
Lasting very briefly
impermanent · short-lived · passing · brief · temporary · disposable · throwaway · stopgap · interim · provisional
- booksnovel, textbooks, study guides, book, paperback
- custom-madecustom-made, customized, personalized, bespoke, tailor-made
- Exceptionsexception, exemption, exclusion, special case, anomaly
- Odditiescuriosity, curio, unusual, odd, strange
- rarityrare, scarce, uncommon, infrequent, scant
- Production Methodsmass production, handmade, artisanal, batch production, assembly line
one-offmass-produced
Made in large quantities
standardized · cookie-cutter · off-the-shelf · stock · prefabricated
one-offserial
Occurring in ordered succession
serialized · episodic · series · ongoing · continuous