English plurals

pluralpluralsback-formedderived from the Frenchplural nounregular nounidentical in the singular and pluralplural in form but usually singular in constructionplural suffixFrench compounds
English nouns are inflected for grammatical number, meaning that if they are of the countable type, they generally have different forms for singular and plural.wikipedia
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Inflection

inflectedinflectional morphologyinflectional
English nouns are inflected for grammatical number, meaning that if they are of the countable type, they generally have different forms for singular and plural.
For details, see English plural, English verbs, and English irregular verbs.

English grammar

Englishgrammarthere is
English nouns are inflected for grammatical number, meaning that if they are of the countable type, they generally have different forms for singular and plural.
In most cases the plural is formed from the singular by adding -[e]s (as in dogs, bushes), although there are also irregular forms (woman/women, foot/feet, etc.), including cases where the two forms are identical (sheep, series). For more details, see English plural.

Morpheme

morphemesmorphemicmonomorphemic
The plural morpheme in English is suffixed to the end of most nouns.
For example, in English, the plural marker -(e)s of regular nouns can be pronounced (bats), (bugs), or, (buses), depending on the final sound of the noun's plural form.

Zero (linguistics)

zeroØ
Some nouns have identical singular and plural (zero inflection).
Similarly, a zero inflection is an unrealized inflection, such as in nouns with identical singular and plural forms. For example, plural of sheep can be analyzed as sheep-∅.

Consonant voicing and devoicing

devoicingvoicingdevoiced
In Old and Middle English voiceless fricatives, mutated to voiced fricatives before a voiced ending.
English no longer has a productive process of voicing stem-final fricatives when forming noun-verb pairs or plural nouns, but there are still examples of voicing from earlier in the history of English:

Plural

pl.plplurals
English nouns are inflected for grammatical number, meaning that if they are of the countable type, they generally have different forms for singular and plural.
(For details and different cases, see English plural).

Old English

Anglo-SaxonSaxonAnglo Saxon
The modern English plural ending -(e)s derives from the Old English -as, but the latter applied only to "strong" masculine nouns in the nominative and accusative cases; different plural endings were used in other instances.

Back-formation

back formationback-formedbackformation
In the American fashion industry it is common to refer to a single pair of pants as a pant —though this is a back-formation, the English word (deriving from the French pantalon) was originally singular.
Many words came into English by this route: Pease was once a mass noun but was reinterpreted as a plural, leading to the back-formation pea.

English words of Greek origin

Greekwords that have been borrowed from Greekfor upsilon in Greek loan-words
Some Greek plurals are preserved in English (cf. Plurals of words of Greek origin):
And there are misleading cases: pentagon comes from Greek pentagonon, so its plural cannot be *pentaga; it is pentagons (Greek πεντάγωνα/pentagona) (cf. Plurals from Latin and Greek).

English verbs

English-edEnglish regular verbs
English verbs
In terms of pronunciation, the ending is pronounced as after sibilants (as in lurches), as after voiceless consonants other than sibilants (as in makes), and as otherwise (as in adds). These are the same rules that apply to the pronunciation of the regular noun plural suffix -[e]s and the possessive -'s.

Biceps

biceps brachiibiceps brachii musclebicep
The term, from Latin, for the main upper arm flexor in the singular is the biceps muscle (from biceps brachii); however, many English speakers take it to be a plural and refer to the muscle of only one arm, by back-formation, as a bicep.
The English form bicep [sic], attested from 1939, is a back formation derived from interpreting the s of biceps as the English plural marker -s.

Postpositive adjective

post-positive adjectivePost-positiveadjectives postpositively
These heads are also nouns and the head usually pluralizes, leaving the second, usually a post-positive adjective, term unchanged:
In the plural forms of expressions with postpositive adjectives or other postpositive modifiers, the pluralizing morpheme (most commonly the suffix -s or -es) is added after the noun, rather than after the entire phrase.

Plurale tantum

pluralia tantumpluralalways plural
Such a noun is called a plurale tantum.
English plural

Pigs in a blanket

pigs in blanketspig in a blanketpølse i svøb
Pigs in a blanket (defective, also pig in a blanket) is a variety of different sausage-based foods in the United States, United Kingdom, Denmark, Republic of Ireland, Germany, Belgium, Russia, Canada, and Japan.

Ox

oxenbullockbullocks
An ox (plural oxen), also known as a bullock in Australia and India, is a bovine trained as a draft animal or riding animal.

Barracks

barrackmilitary barracksquarters
The word may apply to separate housing blocks or to complete complexes, and the plural form often refers to a single structure and may be singular in construction.

Formula

mathematical formulaformulaeformulas
The plural of formula can be spelled either as formulas (from the most common English plural noun form) or, under the influence of scientific Latin, formulae (from the original Latin).

Aurochs

Bos primigeniuswild oxAurochs domestication event
The word is invariable in number in English, though sometimes a back-formed singular auroch and/or innovated plural aurochses occur.

Pound sterling

£poundspounds sterling
The full official name pound sterling (plural: pounds sterling), is used mainly in formal contexts and also when it is necessary to distinguish the United Kingdom currency from other currencies with the same name.

Hippopotamus

hippohipposhippopotami
In English, the plural is "hippopotamuses", but "hippopotami" is also used; "hippos" can be used as a short plural.

A Dictionary of Modern English Usage

FowlerModern English UsageFowler's Modern English Usage
Covering topics such as plurals and literary technique, distinctions among like words (homonyms and synonyms), and the use of foreign terms, the dictionary became the standard for other guides to writing in English.

Bateau

bateauxbatteaubatteaux
The name derives from the French word, bateau, which is simply the word for boat and the plural, bateaux, follows the French, an unusual construction for an English plural.

Cumulativity (linguistics)

cumulativitycumulative reference
The plural form "houses", however, does have cumulative reference.

Toyota Prius

PriusToyota Prius apr GTPrius Eco
In February 2011, Toyota USA asked the US public to decide on what the most proper plural form of Prius should be, with choices including Prien, Prii, Prium, Prius, or Priuses.

Sound change

sound lawsound changesphonetic change
The term "sound change" refers to diachronic changes—that is, irreversible changes in a language's sound system over time; "alternation", on the other hand, refers to changes that happen synchronically (i.e. within the language of an individual speaker, depending on the neighboring sounds) and which do not change the language's underlying system (for example, the -s in the English plural can be pronounced differently depending on what sound it follows, as in bet[s], bed[z]; this is a form of alternation, rather than sound change).