eigenclass.
A hidden class associated with each specific instance of another class.
Meaning & usage
A hidden class associated with each specific instance of another class.
Singleton methods in Ruby live in a special, hidden class called the singleton class (it used to be referred to as the eigenclass, but singleton class is the current term).
Where this word comes from
From eigen- + class.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.