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Vocabulary.com
vocabulary.com › articles › wc › why-do-we-say-oxen-and-not-oxes
Why Do We Say "Oxen" And Not "Oxes"? : Word Count | Vocabulary.com
Vocabulary.com : Word Count - Mignon Fogarty, better known as her alter ego Grammar Girl, has been sharing a series of short tips on usage and style. In her latest installment, she explains why the plural of the word ox is oxen instead of oxes.
Discussions

grammatical number - How did "oxen" (plural of "ox") survive as the only plural form with the Old English plural ending -en? - English Language & Usage Stack Exchange
Oxen is a rare exception in English where it is the only common English word that retains the original Old English plural ending -en. (Note: Children and brethren are formed a bit differently, plea... More on english.stackexchange.com
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How did oxen become the only Old English -an plural to survive?
While I don't know the reason why -s is preferred to -en, oxen certainly isn't the only one to survive. Children and men come to mind, and I'm sure there are more. More on reddit.com
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July 9, 2015
Plural of ox
The Answer: According to the American Heritage Book of English Usage , "oxen" is one of only three commonly used English words to still use the "-en" plural. The others are "children" and "bretheren" (though "brothers" is used for biological brothers). More on preply.com
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September 14, 2016
"Choose the correct plural of the following word: Ox"
The correct answer is option 2) i.e. Oxen. Explanation 'Ox' is a domestic bovine (having qualities characteristic of cows) mamma More on testbook.com
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Dictionary.com
dictionary.com › browse › ox
OX- Definition & Meaning | Dictionary.com
Ox. 2 American ... Informal. a clumsy, stupid fellow. ... an adult castrated male of any domesticated species of cattle, esp Bos taurus, used for draught work and meat · any bovine mammal, esp any of the domestic cattle "Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 · Plural word for ox The plural form of ox is oxen.
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Grammar Monster
grammar-monster.com › plurals › plural_of_ox.htm
The Plural of Ox
Steers are not regarded as fully grown until the age of 4, when they become known as oxen. In English, most words ending in x will form their plural by adding -es to the word. The noun "ox" is an exception to this ruling.
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Old English oxan, plural of oxa, was very common, appearing in the psalter, the bible, and laws, among other places, although the spelling oxen is attested in only one place, in a document relating to Bury St Edmund's possessions, rents, and grants.

The genitive plural form of oxa, often with a syncopated vowel, was ox(e)na. That genitive form is attested in place names (cf. oxenaford, Middle English Oxenford, ModE Oxford, oxeneham ModE Oxnam, oxenesetene ModE Oxsettle Bottom, oxnaleage ModE Oxleigh and Oxley , a woodland clearing or a natural glade, meadow, lea, a plant name oxna-lib glossing Latin oleotropius ModE oxlip, ox-heal), as a unit of measure of land (oxnagang, ModE ox-gang, one-eighth of a "hide"), and in genitive (oxna-paeþ ModE oxens' path) and partitive genitive constructions (ic bohte fif getymu oxena, ic bohte an getyme oxena, ModE I bought five teams of oxen, I bought one team of oxen) and those uses appear not only in texts dealing with quotidien farming and mercantile situations but notably in passages from the Bible, which would frequently have been heard by audiences from all social and economic classes.

The plural appears as oxen and is very well-attested in Middle English in a wide range of texts. It appears in various spellings, including oksen, exen, oxon, oxen, oxsen, oxsin, ocsen (see the MED). Its appearance in proverbial contexts (Moche uolk of religion zetteþ þe zuolȝ be-uore the oksen. Many people of religion set the plow before the oxen) and laws is very strong evidence that it was widely used.

P.S. I have a copy of the Old English corpus and found these attestations by searching it. (I studied Old English and Middle English as an undergraduate and graduate student, back before the days of personal computers, but they haven't changed much in the interim.)

P.P.S. I stumbled upon a book, Working Oxen by Martin Watts. 1999. "... a survey of their use in Britain, their impact upon the countryside, and the relics that can still be found: yokes, bows, shoes, housing and place-names. Martin Watts is curator of the Ryedale Folk Museum in North Yorkshire." [Google Books description] and "Oxen were one of the most important sources of motive power in the British countryside... The working ox has left a lasting mark on the language, landscape and culture... Historians rarely mention or study them. It is as if a history of twentieth century were to ignore the impact of the tractor and the lorry. The purpose of this book is to redress that balance." [from the blurb on Amazon].

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I don't know of any satisfying reason for it.

Note that when the OED says "Old English– oxen (rare)", it means that the specific spelling O-X-E-N was rare in Old English. It doesn't say that oxan was rare, and from the point of view of later development, the difference between Old English oxan and oxen is irrelevant: it was normal for Old English "a" in unstressed syllables to be weakened to schwa, which in Middle English came to be spelled "e". Compare the development of the Old English infinitive ending -an to -e in the case of words like drīfan > drive.

There is a general principle that irregular forms persist longer in frequently used words, but I'm not sure how much it can do to explain the use of the form oxen. I don't think we talk about oxen as much as we used to.

It seems conceivable that the fact that the singular already ends in an /s/ sound made it a bit harder for the sibilant plural to become established, but I'm not really sure if that played an important role: obviously there are multiple other words ending in -x that do form their plurals in -xes, such as foxes, boxes, axes.

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Quora
quora.com › If-the-plural-of-ox-is-oxen-then-why-isnt-the-plural-of-box-boxen
If the plural of ox is oxen, then why isn't the plural of box boxen? - Quora
Answer (1 of 5): Old English was a complex language with two different declensions of noun and many irregular words. The effects of first the Viking invasions and then the Norman Conquest greatly simplified English, stripping away most of its complex grammar. Nowadays, in modern English, almost ...
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Reddit
reddit.com › r/linguistics › how did oxen become the only old english -an plural to survive?
r/linguistics on Reddit: How did oxen become the only Old English -an plural to survive?
July 9, 2015 - Regarding the last form, although many common enough words were given an -an ending for the plural, e.g. guman ‘men’, froggan ‘frogs’, naman ‘names’, tungan ‘tongues’, only one of these has survived, i.e. Old English oxa oxan, though Middle English created a few new n-plurals by adding the -n to nouns like childre, the plural of child ‘child’ to give modern children.
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University of Pennsylvania Department of Linguistics
ling.upenn.edu › ~beatrice › humor › english-lesson.html
Linguistic humor
We'll begin with box, and the plural is boxes; But the plural of ox should be oxen, not oxes.
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Merriam-Webster
merriam-webster.com › dictionary › ox
OX Definition & Meaning - Merriam-Webster
1 month ago - ox noun · ˈäks · plural oxen ˈäk-sən also ox · 1 · : a common large domesticated bovine mammal which is kept for milk, draft, and meat and of which the female is a cow and the male a bull · especially : an adult castrated male · 2 · : any various related bovine mammals (as the buffalo) Nglish: Translation of ox for Spanish Speakers ·
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Blogger
lingwe.blogspot.com › 2009 › 02 › oxen-and-foxes-curious-life-and-death.html
Lingwë - Musings of a Fish: Oxen and Foxes — the curious life and death of plurals - The blog of Tolkien scholar and philologist Jason Fisher
February 13, 2009 - The plural of ox is oxen , but the plural of fox is foxes . Has that ever bothered you? Ever wondered why it is? I have known people to gu...
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Kylian
kylian.ai › blog › en › plural-of-ox
What’s the Plural of Ox? Irregular Forms Explained
May 13, 2025 - The farmer owns five oxen. This irregular plural formation represents one of English's linguistic fossils—preserving an ancient Germanic plural pattern that has largely disappeared from modern usage.
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Homework.Study.com
homework.study.com › explanation › what-is-the-plural-of-ox.html
What is the plural of ox? | Homework.Study.com
Despite words like fox or box - which plural forms are foxes and boxes - the plural of ox is not oxes, but rather oxen.
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Lumen Learning
courses.lumenlearning.com › wm-englishcomposition1 › chapter › text-nouns
Nouns | English Composition I
stimuli is the plural of stimulus. The singular ends with a -us, so the plural ends with an -i. ox is the singular of oxen. This is an –en noun.
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FactMonster
factmonster.com › askeds › plural-ox
Plural of "ox"
August 7, 2018 - According to the American Heritage Book of English Usage, "oxen" is one of only three commonly used English words to still use the "-en" plural. The others are "children" and "bretheren" (though "brothers" is used for biological brothers). The use of -en used to be more common, but fell out ...