Thou
Overview
 
The word thou is a second person
Grammatical person
Grammatical person, in linguistics, is deictic reference to a participant in an event; such as the speaker, the addressee, or others. Grammatical person typically defines a language's set of personal pronouns...

 singular
Grammatical number
In linguistics, grammatical number is a grammatical category of nouns, pronouns, and adjective and verb agreement that expresses count distinctions ....

 pronoun
Pronoun
In linguistics and grammar, a pronoun is a pro-form that substitutes for a noun , such as, in English, the words it and he...

 in English
English language
English is a West Germanic language that arose in the Anglo-Saxon kingdoms of England and spread into what was to become south-east Scotland under the influence of the Anglian medieval kingdom of Northumbria...

. It is now largely archaic
Archaism
In language, an archaism is the use of a form of speech or writing that is no longer current. This can either be done deliberately or as part of a specific jargon or formula...

, having been replaced in almost all contexts by you
You
You is the second-personpersonal pronoun, both singular and plural, and both nominative and objective case, in Modern English. The oblique/objective form you functioned originally as both accusative and dative)...

. It is used in parts of Northern England and by Scots
Modern Scots
Modern Scots describes the varieties of Scots traditionally spoken in Lowland Scotland and parts of Ulster from 1700.Throughout its history, Modern Scots has been undergoing a process of language attrition, whereby successive generations of speakers have adopted more and more features from...

. Thou is the nominative
Nominative case
The nominative case is one of the grammatical cases of a noun or other part of speech, which generally marks the subject of a verb or the predicate noun or predicate adjective, as opposed to its object or other verb arguments...

 form; the oblique
Oblique case
An oblique case in linguistics is a noun case of synthetic languages that is used generally when a noun is the object of a verb or a preposition...

/objective
Objective (grammar)
An objective pronoun in grammar functions as the target of a verb, as distinguished from a subjective pronoun, which is the initiator of a verb. Objective pronouns are instances of the oblique case....

 form is thee (functioning as both accusative
Accusative case
The accusative case of a noun is the grammatical case used to mark the direct object of a transitive verb. The same case is used in many languages for the objects of prepositions...

 and dative
Dative case
The dative case is a grammatical case generally used to indicate the noun to whom something is given, as in "George gave Jamie a drink"....

), and the possessive is thy or thine. Almost all verb
Verb
A verb, from the Latin verbum meaning word, is a word that in syntax conveys an action , or a state of being . In the usual description of English, the basic form, with or without the particle to, is the infinitive...

s following thou have the endings -st or -est; e.g., "thou goest." In Middle English
Middle English
Middle English is the stage in the history of the English language during the High and Late Middle Ages, or roughly during the four centuries between the late 11th and the late 15th century....

, thou was sometimes abbreviated by putting a small "u" over the letter thorn
Thorn (letter)
Thorn or þorn , is a letter in the Old English, Old Norse, and Icelandic alphabets, as well as some dialects of Middle English. It was also used in medieval Scandinavia, but was later replaced with the digraph th. The letter originated from the rune in the Elder Fuþark, called thorn in the...

: .

Originally, thou was simply the singular counterpart to the plural pronoun ye
Ye (pronoun)
Ye was the second-person, plural, personal pronoun , spelled in Old English as "ge". In Middle English and Early Modern English, it was used to direct an equal or superior person...

, derived from an ancient Indo-European
Proto-Indo-European language
The Proto-Indo-European language is the reconstructed common ancestor of the Indo-European languages, spoken by the Proto-Indo-Europeans...

 root.
 
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