The capital letter "A" in the Latin alphabet followed by its lowercase equivalent, in sans serif and seriftypefaces, respectively
Capitalization (North American English), or capitalisation is writing a word with its first letter as a capital letter (uppercase letter) and the remaining letters in lower case, in writing systems with a case distinction. The term also may refer to the choice of the casing applied to text.
Conventional writing systems (orthographies) for different languages have different conventions for capitalization, for example the capitalization of titles. Conventions also vary, to a lesser extent, between different style guides.
The full rules of capitalization for English are complicated. The rules have also changed over time, generally to capitalize fewer words. The conventions used in an 18th century document will be unfamiliar to a modern reader; for instance many common nouns are capitalized.
The systematic use of capitalized and uncapitalized words in running text is called "mixed case".
Owing to the essentially arbitrary nature of orthographic classification and the existence of variant authorities and local house styles, questionable capitalization of words is not uncommon, even in respected newspapers and magazines. Most publishers require consistency, at least within the same document, in applying a specified standard: this is described as "house style".
In English, the subjective form of the singular first-person pronoun, "I", is capitalized, along with all its contractions such as I'll and I'm. Object and possessive forms "me", "my", and "mine" are not.
Many European languages traditionally capitalize nouns and pronouns used to refer to God, including references to Jesus Christ (reverential capitals): hallowed be Thy name, look what He has done. Some English authors capitalize any word referring to God: the Lamb, the Almighty; some capitalize "Thy Name". These practices have become much less common in English in the 20th and 21st centuries.
In German, the formal 2nd person plural pronoun Sie is capitalized along with all its case-forms (Ihre, Ihres, etc.), but these words are not capitalized when used as 3rd person feminine singular or plural pronouns. Until the recent German spelling reform(s), the traditional rules (which are still widely adhered to, although not taught in schools) also capitalized the informal 2nd person singular pronoun Du (and its derivatives, such as Dein) when used in letters or similar texts, but this is no longer required.
Italian also capitalizes its formal pronouns, Lei and Loro, and their cases (even within words, e.g. arrivederLa "goodbye", formal). This is occasionally also done for the DutchU, though this is formally only required when referring to a deity and may be considered archaic.
In Spanish, the abbreviations of the pronouns usted and ustedes, Ud., Uds., Vd., and Vds., are usually written with a capital.
In Finnish, the second-person plural pronoun can be used when formally addressing a single person, and in writing the pronoun is sometimes capitalized as Te to indicate special regard. In a more familiar tone, one can also capitalize the second-person singular pronoun Sinä.
Similarly, in Russian the formal second-person pronoun Вы, and its oblique casesВас, Вам etc., are capitalized (usually in personal correspondence); also in Bulgarian.
Slovenian, Croatian, Serbian capitalize the formal second-person pronoun Vi along with its oblique cases (Vas, Vam, Vami) and personal pronoun (Vaš etc.) in formal correspondence. Historically, the familiar second-person pronoun ti and its cases (tebe, tebi, teboj) were capitalized as well, but new orthography prohibits such use.
In Danish, the plural second-person pronoun, I, is capitalized, but its other forms jer and jeres are not. This distinguishes it from the preposition i ("in"). The formal second-person pronoun is also capitalized in all its forms (De, Dem, Deres), distinguishing it from the otherwise identical third-person plural pronouns.
In Norwegian, both second person singular and plural have a capitalized alternative form (De, Dem, Deres in Bokmål; De, Dykk, Dykkar in Nynorsk) to express formality for both subject and object of a sentence, but is very rarely used in modern speech and writing.
In formally written Polish, Czech, Slovak and Latvian, most notably in letters and e-mails, all pronouns referring to the addressee are capitalized. This includes Ty ("thou") and all its related forms such as Twój and Ciebie. This principle extends to nouns used formally to address the addressee of a letter, such as Pan ("sir") and Pani ("madam").
In Indonesian, capitalizing the formal second-person pronoun Anda along with all references to the addressee, such as "(kepada) Bapak/Ibu" ((to) Sir/Madam), is required in practice of Ejaan Yang Disempurnakan (Perfected Orthography). However, some people do not know of or choose not to adhere to this spelling rule. In contrast, Malay orthography used in Malaysia, Singapore and Brunei does not require the capitalization of anda.
In Tagalog and its standard form, Filipino, the formal second-person pronouns Kayo and Ninyo and their oblique form Inyo are customarily and reverentially capitalized as such, particularly in most digital and printed media related to religion and its references. Purists who consider this rule as nonstandard and inconsistent do not apply it when writing.
In Tajik, capitalization is used to distinguish the second person formal pronoun Шумо from the second person plural pronoun шумо.
In Swedish, since du-reformen, the second person singular pronoun du may be capitalized as Du when addressed formally.
Sometimes, the article is integral to the name, and thus is capitalized (as in Den Haag, Le Havre). However, in French this does not occur for contractions du and contractions du and au (as in Je viens du Havre, "I come from Le Havre"). In other European languages, it is much more common for the article to be treated as integral to the name, but it may not be capitalized (die Schweiz, les Pays-Bas, yr Almaen etc.).
A few English names are written with two lowercase "f"s: ffrench, ffoulkes, etc. This originated as a variant script for capital F.
A few individuals have chosen not to use capitals in their names, such as k.d. lang and bell hooks. E. E. Cummings, whose name is often written without capitals, did not do so himself: the usage derives from the typography used on the cover of one of his books.
In English, the names of days of the week, months and languages are capitalized, as are demonyms like Englishman, Arab. In other languages, practice varies, but most languages other than German (which capitalizes all nouns) do not.
In English-language addresses, the noun following the proper name of a street is capitalized, whether or not it is abbreviated: "Main Street", "Fleming Ave.", "Montgomery Blvd.", but in French, street names are capitalized when they are proper names; the noun itself (rue, place) is normally not capitalized: rue de Rivoli, place de la Concorde.
In Italian the name of a particular concept or object is capitalized when the writer wants to emphasize its importance and significance.
Controversially, some authors capitalize common names of some animal and plant species. As a general rule, names are not capitalized, unless they are part of an official list of names, in which case they have become proper nouns and are capitalized. This is most common for birds and fishes. Names referring to more than one species (e.g., horse or cat) are always in lower case. Botanists generally do not capitalize the common names of plants, though individual words in plant names may be capitalized for another reason: (Italian stone pine). See the discussion of official common names under common name for an explanation.
Common nouns may be capitalized when used as names for the entire class of such things, e.g. what a piece of work is Man. French often capitalizes such nouns as l'État (the state) and l'Église (the church) when not referring to specific ones.
Names by which gods are known are capitalized, including God, Athena, and Vishnu. The word god is generally not capitalized if it is used to refer to the generic idea of a deity, nor is it capitalized when it refers to multiple gods, e.g. Roman gods. There may be some confusion because Judaism, Christianity, and Islam rarely refer to the Deity by a specific name, but simply as God (see Writing divine names). Other names for the God of these three Abrahamic faiths, such as Elohim, Yahweh, and Lord, are also capitalized.
While acronyms have historically been written in all-caps, British usage is moving towards capitalizing only the first letter in cases when these are pronounced as words (e.g. Unesco and Nato), reserving all-caps for initialisms (e.g. UK, USA, UNHCR).
In legal English, defined terms that refer to a specific entity, such as "Tenant" and "Lessor", are often capitalized. More specifically, in legal documents, terms which are formally defined elsewhere in the document or a related document (often in a schedule of definitions) are capitalized to indicate that that is the case, and may be several words long, e.g. "the Second Subsidiary Claimant", "the Agreed Conditional Release Date".
Most English honorifics and titles of persons, e.g. Sir, Dr Watson, Mrs Jones, His Royal Highness the Duke of Edinburgh. This does not apply where the words are not titles; e.g. Watson is a doctor, Philip is a duke.
In English, adjectives derived from proper nouns (except the names of characters in fictional works) usually retain their capitalization: e.g. a Christian church, Canadian whisky, a Shakespearean sonnet, but not a quixotic mission nor malapropism. Where the original capital is no longer at the beginning of the word, usage varies: anti-Christian, and either Presocratic, pre-Socratic, Pre-Socratic or presocratic. Never preSocratic – a hyphen must precede a capital in a compound word.
Such adjectives do not receive capitals in French (socratique, présocratique), Spanish (socrático, presocrático), Swedish (sokratisk, försokratisk), Polish (sokratejski, presokratejski) nor partly in German (sokratisch, präsokratisch, but Ohm'sches Gesetz ("Ohm's Law")). In German, if the adjective becomes a noun by using an article or numeral in front of it (das/die Bunte (the colorful thing(s)), eine Schöne (a beautiful one)), it is capitalized like any other noun, as are nouns formed from proper nouns (der Urgoethe). The same applies to verbs (das Laufen (the (practice of) running), das Spazierengehen (the (practice of) going for a walk)).
Whether geographic adjectives – adjectives referring to cities, countries and other geographic places – are capitalized in German depends on their ending: Geographic adjectives ending in "-er" in their base form are capitalized, others are not. This can feel strange where both forms of the adjective exist for a particular place. For example, one can refer to something being from Mecklenburg by calling it either "Mecklenburger" or "mecklenburgisch".
Adjectives referring to nationality or ethnicity are not capitalized in German, French or Czech, even though nouns are: ein kanadisches Schiff, un navire canadien, kanadská loď, a Canadian ship; ein Kanadier, un Canadien, Kanaďan, a Canadian. Both nouns and adjectives are capitalized in English when referring to nationality or ethnicity.
In very formal British English the Queen is referred to as The Queen.
The governing body of English solicitors is correctly referred to as The Law Society. (In general any organisation may choose a name starting with a capitalised "The".)