singletons
One-of-a-kind items
Singletons are things occurring alone rather than in pairs or groups.
In card games, a singleton is the only card of a particular suit in a hand.
Parents of singletons have only one child—no siblings to share attention.
In software design, a singleton is an object of which only one instance can exist.
The word usually implies isolation or uniqueness within a set: The study compared twins with singletons.
Individual part or measure
Existing alone, apart
- aloneWithout others present
- soloPerformance by one
- unaccompaniedWithout others present
- loneExisting by itself
unmarried · bachelor · bachelorette · unattached · independent · self-sufficient · autonomous · self-reliant
Something that takes place
- instanceSingle occurrence of something
- eventA notable occurrence
- one-timeOccurring only once
- onceAt one time
isolated · sporadic · infrequent · occasional · unrepeatable · fleeting · momentary · ephemeral
Having no equivalent
- unrepeatedHappening only once
- rareSeldom found or seen
- anomalyDeparture from the expected
- outlierDistant data point
exception · aberration · oddity · peculiarity · curiosity · standalone · sui generis · unprecedented
unit
Individual part or measure
- elementBasic substance or factor
- instanceSingle occurrence of something
- recordPreserved account or achievement
entry · item · entity · object · node · datum · tuple · row · card · set
solitary
Existing alone, apart
- aloneWithout others present
- soloPerformance by one
- unaccompaniedWithout others present
lone · unmarried · bachelor · bachelorette · unattached · independent · self-sufficient · autonomous · self-reliant · loner
occurrence
Something that takes place
once · isolated · sporadic · infrequent · occasional · unrepeatable · fleeting · momentary · ephemeral · transient
one-of-a-kind
Having no equivalent
- unrepeatedHappening only once
- rareSeldom found or seen
- anomalyDeparture from the expected
outlier · exception · aberration · oddity · peculiarity · curiosity · standalone · sui generis · unprecedented · unmatched
unmatched
Having no equal
remaining · orphan · mismatched · incomplete · widowed · solo · stray · lone · extra · surplus
- topologymanifolds, compactness, neighborhoods, torus, connectedness
- number setsnatural numbers, integers, rational numbers, rationals, whole numbers
- modular designmodularity, modules, components, encapsulation, decoupling
singletonsmultiples
Quantities divisible evenly
pluralities · pairs · triplets · multiplicities · groups
singletonstwins
Siblings born simultaneously
triplets · quadruplets · quintuplets · multiples · multiple births