See undefined in All languages combined, or Wiktionary
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"derived": [
{
"word": "undefined behavior"
},
{
"word": "undefinedly"
},
{
"word": "undefinedness"
}
],
"etymology_templates": [
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"expansion": "Etymology tree\nProto-Indo-European *né\nProto-Indo-European *n̥-\nProto-Germanic *un-\nProto-West Germanic *un-\nOld English un-\nMiddle English un-\nEnglish un-\nEnglish defined\nEnglish undefined\n[Appendix:Glossary#inherited|Inherited]] from\", \"keyword\" : \"inherited\" } ], \"status\" : \"ok\", \"lang_name\" : \"Proto-Germanic\", \"term\" : \"*un-\", \"lang\" : \"gem-pro\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"status\" : \"ok\", \"lang_name\" : \"Proto-West Germanic\", \"term\" : \"*un-\", \"lang\" : \"gmw-pro\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"status\" : \"ok\", \"lang_name\" : \"Old English\", \"term\" : \"un-\", \"lang\" : \"ang\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"status\" : \"ok\", \"lang_name\" : \"Middle English\", \"term\" : \"un-\", \"lang\" : \"enm\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"status\" : \"ok\", \"lang_name\" : \"English\", \"term\" : \"un-\", \"lang\" : \"en\" }, { \"children\" : [ ], \"lang_name\" : \"English\", \"term\" : \"defined\", \"status\" : \"missing\", \"lang\" : \"en\" } ], \"keyword_label\" : \"From\", \"is_group\" : true, \"keyword\" : \"affix\" } ], \"lang_name\" : \"English\", \"term\" : \"undefined\", \"status\" : \"ok\", \"lang\" : \"en\" }\" data-lang=\"en\" data-title=\"undefined\">\nFrom un- + defined.",
"name": "ety"
}
],
"etymology_text": "Etymology tree\nProto-Indo-European *né\nProto-Indo-European *n̥-\nProto-Germanic *un-\nProto-West Germanic *un-\nOld English un-\nMiddle English un-\nEnglish un-\nEnglish defined\nEnglish undefined\nFrom un- + defined.",
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"ref": "1992, Lia Matera, Prior Convictions, page 121:",
"text": "We slid into our office, past two women discussing the \"X factor,\" an apparently undefined quality their firm felt they lacked.",
"type": "quotation"
}
],
"glosses": [
"Lacking a definition or value."
],
"links": [
[
"definition",
"definition"
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[
"value",
"value"
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"tags": [
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72,
81
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],
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}
],
"glosses": [
"That does not have a logically sound meaning within a specific formal system and is thus not assigned an interpretation."
],
"links": [
[
"mathematics",
"mathematics"
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[
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[
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[
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"tags": [
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],
"glosses": [
"That behaves unreliably due to dependence on an uninitialized value or inconsistently ported code."
],
"links": [
[
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"computing#Noun"
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],
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],
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],
"synonyms": [
{
"sense": "lacking a definition or value",
"word": "indefinite"
},
{
"word": "undefinable"
},
{
"word": "vague"
}
],
"translations": [
{
"code": "bg",
"lang": "Bulgarian",
"lang_code": "bg",
"roman": "neopredelén",
"sense": "lacking definition or value",
"word": "неопределе́н"
},
{
"code": "ca",
"lang": "Catalan",
"lang_code": "ca",
"sense": "lacking definition or value",
"word": "indefinit"
},
{
"code": "cmn",
"lang": "Chinese Mandarin",
"lang_code": "cmn",
"roman": "wèidìngyì",
"sense": "lacking definition or value",
"word": "未定義 /未定义"
},
{
"code": "cs",
"lang": "Czech",
"lang_code": "cs",
"sense": "lacking definition or value",
"word": "nedefinovaný"
},
{
"code": "fi",
"lang": "Finnish",
"lang_code": "fi",
"sense": "lacking definition or value",
"word": "määrittelemätön"
},
{
"code": "fi",
"lang": "Finnish",
"lang_code": "fi",
"sense": "lacking definition or value",
"word": "epämääräinen"
},
{
"code": "fr",
"lang": "French",
"lang_code": "fr",
"sense": "lacking definition or value",
"word": "indéfini"
},
{
"code": "it",
"lang": "Italian",
"lang_code": "it",
"sense": "lacking definition or value",
"word": "indefinito"
},
{
"code": "pl",
"lang": "Polish",
"lang_code": "pl",
"sense": "lacking definition or value",
"word": "niezdefiniowany"
},
{
"code": "pl",
"lang": "Polish",
"lang_code": "pl",
"sense": "lacking definition or value",
"word": "nieokreślony"
},
{
"code": "pt",
"lang": "Portuguese",
"lang_code": "pt",
"sense": "lacking definition or value",
"word": "indefinido"
},
{
"code": "ro",
"lang": "Romanian",
"lang_code": "ro",
"sense": "lacking definition or value",
"word": "nedefinit"
},
{
"code": "ru",
"lang": "Russian",
"lang_code": "ru",
"roman": "neopredeljónnyj",
"sense": "lacking definition or value",
"word": "неопределённый"
},
{
"code": "es",
"lang": "Spanish",
"lang_code": "es",
"sense": "lacking definition or value",
"word": "indefinido"
},
{
"code": "ca",
"lang": "Catalan",
"lang_code": "ca",
"sense": "mathematics: without interpretation",
"word": "indefinit"
},
{
"code": "fi",
"lang": "Finnish",
"lang_code": "fi",
"sense": "mathematics: without interpretation",
"word": "määrittelemätön"
},
{
"code": "fr",
"lang": "French",
"lang_code": "fr",
"sense": "mathematics: without interpretation",
"word": "indéfini"
},
{
"code": "ro",
"lang": "Romanian",
"lang_code": "ro",
"sense": "mathematics: without interpretation",
"word": "nedefinit"
},
{
"code": "ru",
"lang": "Russian",
"lang_code": "ru",
"roman": "neopredeljónnyj",
"sense": "mathematics: without interpretation",
"word": "неопределённый"
},
{
"code": "vi",
"lang": "Vietnamese",
"lang_code": "vi",
"sense": "mathematics: without interpretation",
"word": "không xác định"
}
],
"word": "undefined"
}
{
"categories": [
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"English countable nouns",
"English entries referencing missing etymons",
"English entries with etymology texts",
"English entries with etymology trees",
"English entries with etymon",
"English entries with incorrect language header",
"English lemmas",
"English nouns",
"English terms derived from the Proto-Indo-European word *né",
"English terms prefixed with un- (negative)",
"English uncomparable adjectives",
"Entries with translation boxes",
"Pages using etymon with no ID",
"Pages with 1 entry",
"Pages with entries",
"Pages with etymology trees",
"Pages with etymon",
"Terms with Bulgarian translations",
"Terms with Catalan translations",
"Terms with Czech translations",
"Terms with Finnish translations",
"Terms with French translations",
"Terms with Italian translations",
"Terms with Mandarin translations",
"Terms with Polish translations",
"Terms with Portuguese translations",
"Terms with Romanian translations",
"Terms with Russian translations",
"Terms with Spanish translations",
"Terms with Vietnamese translations"
],
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"expansion": "Etymology tree\nProto-Indo-European *né\nProto-Indo-European *n̥-\nProto-Germanic *un-\nProto-West Germanic *un-\nOld English un-\nMiddle English un-\nEnglish un-\nEnglish defined\nEnglish undefined\n[Appendix:Glossary#inherited|Inherited]] from\", \"keyword\" : \"inherited\" } ], \"status\" : \"ok\", \"lang_name\" : \"Proto-Germanic\", \"term\" : \"*un-\", \"lang\" : \"gem-pro\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"status\" : \"ok\", \"lang_name\" : \"Proto-West Germanic\", \"term\" : \"*un-\", \"lang\" : \"gmw-pro\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"status\" : \"ok\", \"lang_name\" : \"Old English\", \"term\" : \"un-\", \"lang\" : \"ang\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"status\" : \"ok\", \"lang_name\" : \"Middle English\", \"term\" : \"un-\", \"lang\" : \"enm\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"status\" : \"ok\", \"lang_name\" : \"English\", \"term\" : \"un-\", \"lang\" : \"en\" }, { \"children\" : [ ], \"lang_name\" : \"English\", \"term\" : \"defined\", \"status\" : \"missing\", \"lang\" : \"en\" } ], \"keyword_label\" : \"From\", \"is_group\" : true, \"keyword\" : \"affix\" } ], \"lang_name\" : \"English\", \"term\" : \"undefined\", \"status\" : \"ok\", \"lang\" : \"en\" }\" data-lang=\"en\" data-title=\"undefined\">\nFrom un- + defined.",
"name": "ety"
}
],
"etymology_text": "Etymology tree\nProto-Indo-European *né\nProto-Indo-European *n̥-\nProto-Germanic *un-\nProto-West Germanic *un-\nOld English un-\nMiddle English un-\nEnglish un-\nEnglish defined\nEnglish undefined\nFrom un- + defined.",
"forms": [
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"tags": [
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"categories": [
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"ref": "1987, J. E. Lapin, Portable C and UNIX System Programming (Prentice-Hall Software Series), Englewood Cliffs, N.J.: Prentice-Hall, Inc., →ISBN, page 72:",
"text": "[Option:] · [PDP11:] F [BSD:] · [XE 2.3:] [1] [XE 3.0:] · [SIII:] · [COFF:] · [meaning:] make undefineds global",
"type": "quotation"
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186
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"ref": "1988, Pearl Brereton, editor, Software Engineering Environments, Chichester, West Sussex: Ellis Horwood Limited, →ISBN, page 230:",
"text": "Every operation is defined completely either by delivering a value of some type depending only on the types of its operands or by causing some defined exception; there are no ‘undefineds’ in Ten15.",
"type": "quotation"
},
{
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94,
104
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],
"ref": "2017, Neos. Thanh, “Arrays”, in JavaScript Programming, →ISBN, page 36:",
"text": "The Array object has these commonly-used properties: • .length: the number of items including undefineds.",
"type": "quotation"
}
],
"glosses": [
"An undefined value."
],
"links": [
[
"computing",
"computing#Noun"
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[
"undefined",
"#Adjective"
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],
"raw_glosses": [
"(computing) An undefined value."
],
"topics": [
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"engineering",
"mathematics",
"natural-sciences",
"physical-sciences",
"sciences"
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"tags": [
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"word": "undefined"
}
Download raw JSONL data for undefined meaning in English (13.2kB)
This page is a part of the kaikki.org machine-readable English dictionary. This dictionary is based on structured data extracted on 2026-09-09 from the enwiktionary dump dated 2026-09-02 using wiktextract (ccec6f1 and 4deed51). The data shown on this site has been post-processed and various details (e.g., extra categories) removed, some information disambiguated, and additional data merged from other sources. See the raw data download page for the unprocessed wiktextract data.
If you use this data in academic research, please cite Tatu Ylonen: Wiktextract: Wiktionary as Machine-Readable Structured Data, Proceedings of the 13th Conference on Language Resources and Evaluation (LREC), pp. 1317-1325, Marseille, 20-25 June 2022. Linking to the relevant page(s) under https://kaikki.org would also be greatly appreciated.