"defeater" meaning in English

See defeater in All languages combined, or Wiktionary

Noun

IPA: /dɪˈfiːtə(ɹ)/ [UK] Forms: defeaters [plural]
Etymology: Etymology tree English defeat Proto-Indo-European *-yósder. Proto-Italic *-āzijos Latin -āriusnom. Latin -āriusbor. Proto-Germanic *-ārijaz Proto-West Germanic *-ārī Old English -ere Middle English -ere English -er English defeater From defeat + -er. Etymology templates: {{ety|en|:af|defeat|-er<id:agent noun>|text=+|tree=1}} Etymology tree English defeat Proto-Indo-European *-yósder. Proto-Italic *-āzijos Latin -āriusnom. Latin -āriusbor. Proto-Germanic *-ārijaz Proto-West Germanic *-ārī Old English -ere Middle English -ere English -er English defeater [Appendix:Glossary#loanword|Borrowed]] from", "terms" : [ { "id" : "agent noun", "children" : [ { "keyword_abbrev" : "nom.", "keyword_label" : "Nominalization of", "terms" : [ { "id" : "adjective", "children" : [ { "terms" : [ { "id" : "adjective", "children" : [ { "keyword_abbrev" : "der.", "keyword_label" : "Derived from", "terms" : [ { "id" : "suffix", "children" : [ ], "status" : "ok", "lang_name" : "Proto-Indo-European", "term" : "*-yós", "lang" : "ine-pro" } ], "keyword" : "derived" } ], "status" : "ok", "lang_name" : "Proto-Italic", "term" : "*-āzijos", "lang" : "itc-pro" } ], "keyword_label" : "Inherited from", "keyword" : "inherited" } ], "status" : "ok", "lang_name" : "Latin", "term" : "-ārius", "lang" : "la" } ], "keyword" : "nominalization" } ], "status" : "ok", "lang_name" : "Latin", "term" : "-ārius", "lang" : "la" } ], "keyword" : "bor" } ], "status" : "ok", "lang_name" : "Proto-Germanic", "term" : "*-ārijaz", "lang" : "gem-pro" } ], "keyword_label" : "Inherited from", "keyword" : "inherited" } ], "status" : "ok", "lang_name" : "Proto-West Germanic", "term" : "*-ārī", "lang" : "gmw-pro" } ], "keyword_label" : "Inherited from", "keyword" : "inherited" } ], "status" : "ok", "lang_name" : "Old English", "term" : "-ere", "lang" : "ang" } ], "keyword_label" : "Inherited from", "keyword" : "inherited" } ], "status" : "ok", "lang_name" : "Middle English", "term" : "-ere", "lang" : "enm" } ], "keyword_label" : "Inherited from", "keyword" : "inherited" } ], "status" : "ok", "lang_name" : "English", "term" : "-er", "lang" : "en" } ], "keyword_label" : "From", "is_group" : true, "keyword" : "affix" } ], "lang_name" : "English", "term" : "defeater", "status" : "ok", "lang" : "en" }" data-lang="en" data-title="defeater"> From defeat + -er. Head templates: {{en-noun}} defeater (plural defeaters)
  1. One who defeats.
    Sense id: en-defeater-en-noun-4CDYXeO0 Categories (other): English entries referencing missing etymons, English entries with etymology texts, English entries with etymology trees, English entries with incorrect language header, Pages using etymon with no ID, Pages with entries, Pages with etymology trees Disambiguation of English entries referencing missing etymons: 50 50 Disambiguation of English entries with etymology texts: 48 52 Disambiguation of English entries with etymology trees: 48 52 Disambiguation of English entries with incorrect language header: 53 47 Disambiguation of Pages using etymon with no ID: 55 45 Disambiguation of Pages with entries: 51 49 Disambiguation of Pages with etymology trees: 46 54
  2. (logic, philosophy) a belief which, if proved to be true, would imply outright or indirectly that another belief were false.
    Sense id: en-defeater-en-noun-eIfbrtzQ Categories (other): Logic, Philosophy, English entries referencing missing etymons, English entries with etymology texts, English entries with etymology trees, English entries with incorrect language header, English terms suffixed with -er (agent noun), Pages using etymon with no ID, Pages with 1 entry, Pages with entries, Pages with etymology trees Disambiguation of English entries referencing missing etymons: 50 50 Disambiguation of English entries with etymology texts: 48 52 Disambiguation of English entries with etymology trees: 48 52 Disambiguation of English entries with incorrect language header: 53 47 Disambiguation of English terms suffixed with -er (agent noun): 33 67 Disambiguation of Pages using etymon with no ID: 55 45 Disambiguation of Pages with 1 entry: 40 60 Disambiguation of Pages with entries: 51 49 Disambiguation of Pages with etymology trees: 46 54 Topics: human-sciences, logic, mathematics, philosophy, sciences

Inflected forms

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        "(logic, philosophy) a belief which, if proved to be true, would imply outright or indirectly that another belief were false."
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}

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This page is a part of the kaikki.org machine-readable English dictionary. This dictionary is based on structured data extracted on 2026-06-15 from the enwiktionary dump dated 2026-06-01 using wiktextract (03da280 and 7f4db16). 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.