From single +‎ -ton, probably following the model of simpleton.

• (General American, Received Pronunciation) IPA^(key): /ˈsɪŋ.ɡ(ə)l.tən/

• Audio (General American):

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singleton (plural singletons)

1. (playing cards) A playing card that is the only one of its suit in a hand, especially at bridge.
2. (playing cards) A hand containing only one card of a certain suit.
3. A single object, especially one of a group.
4. (computing) A class that may not be instantiated more than once, i.e. that implements the singleton design pattern.
5. (mathematics) A set with exactly one element.
6. A child or animal that is born singly, not as a twin or other multiple birth.

   singleton preterm birth

   • 2015 October 23, “Periconception Maternal Folate Status and Human Embryonic Cerebellum Growth Trajectories: The Rotterdam Predict Study”, in PLOS ONE‎^[1], →DOI:

     Viable non-malformed singleton pregnancies were selected for cerebellar measurements; transcerebellar diameter, (TCD), left and right cerebellar diameters (LCD, RCD).

7. A person without a romantic partner.
   • 2012 February 11, Katie Gile, “I hate/love Valentine’s Day”, in Spinnaker‎^[2], Jacksonville, Fla.: University of North Florida, archived from the original on 18 September 2020:

     The time draws near when pink and red creep insidiously into the periphery, jewelry retailers go into overdrive and drugstore aisles burst with cherubs for the one holiday of the year that separates the singletons from the significant-othered.

   • 2022 August 14, “Lessons in love”, in The Sunday People‎^[3]:

     Millennials and Gen Zedders’ approach to romance can teach later-life singletons a thing or two about new relationships, according to dating agent Anna Williamson.

8. A person without a dissociative identity.
9. (phonetics) A single consonant, as opposed to a geminated consonant.

   singleton sonorants

10. (backgammon) Synonym of blot.
11. (education) A class offered only once within a school year.

• wedder

• nonsingleton
• singleton set

singleton (comparative more singleton, superlative most singleton)

1. (education) Of a class offered only once within a school year.

   a singleton class

• multiton

• IPA^(key): /ˈsɪŋɡəltɔn/, /ˈsɪŋəltɔn/

singleton m (plural singletons, diminutive singletonnetje n)

1. a singleton (lone playing card)

singleton n (plural singletons, diminutive singletonnetje n)

1. a singleton (design pattern, class, set)

• Audio (France (Vosges)):

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• Audio (France (Somain)):

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singleton m (plural singletons)

1. card games singleton
2. mathematics singleton
3. computing singleton

• “singleton”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012

Borrowed from English singleton.

• IPA^(key): /siŋˈɡlɛ.tɔn/
• Rhymes: -ɛtɔn
• Syllabification: sin‧gle‧ton

singleton m inan

1. (object-oriented programming, software engineering) singleton, singleton pattern (creational design pattern that restricts the instantiation of a class to one object)

   Coordinate term: multiton

2. (set theory) singleton, unit set, one-point set (set with exactly one element)

   Synonyms: zbiór jednoelementowy, zbiór jednostkowy

3. (card games) singleton (playing card that is the only one of its suit in a hand, especially at bridge)

   Synonym: singel

• singleton in Polish dictionaries at PWN

singleton m (plural singletons)

1. (computing) singleton (class that may not be instantiated more than once)

Borrowed from English singleton.

singleton n (uncountable)

1. singleton

• singleton in Academia Română, Micul dicționar academic, ediția a II-a, Bucharest: Univers Enciclopedic, 2010. →ISBN

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