Proper nouns may begin with an upper-case character, but this is not a necessary condition. Furthermore, all nouns that begin with an upper-case character are not proper nouns. For example, names for inhabitants like Français, Africain, etc., or names for feast days like Pâques, are considered as common nouns (see below for criteria). Moreover, upper-case characters occur on the words which begin a sentence and on emphasised words in titles or running text (l'Etat souverain). Consequently, this criterion is neither sufficient nor necessary.
Test:
If X begins with an upper-case character, it may be a proper noun.
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If a noun is incompatible with the definite article (i.e. if the noun is in the singular form) and if it occupies the syntactic position of a subject without a specifying adjective, without a complement and without a restrictive relative phrase, then it is a proper noun. In other words, proper nouns need no other elements, like determiners, to occupy non-terminal phrases. Proper nouns have this behaviour in common with pronouns, but proper nouns do not play the role of substitutes for a noun phrase.
The opposite of this criterion is not true: any noun that occupies a noun phrase with a determiner is not a common noun (example: les Alpes, see below). Notice also that, in certain cases, the morphological unit le is part of the proper noun (example: Le Havre). This criterion is therefore sufficient but not necessary.
Test:
Given Det a determiner, NP a noun phrase: if NP (Det + X + notY) or NP (Det + notY + X) with function=subject fails, then X is a proper noun.
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Proper nouns are non descriptive nominals that denote single, individual objects. Note that common nouns like `soleil', `lune', `terre', `voie lactée', etc., also denote single, individual objects (for tests see below). If proper nouns are in the plural form, they denote several individuals or objects which have the same name (``tous les Martin de l'annuaire'').
Test:
Given X a noun that is a candidate for a proper noun, and given a descriptive nominal phrase NP, with both X and NP denoting the same object: if coordination under the same NP fails, then X can be a proper noun. Note that this is not necessarily the case, if the common noun denotes a single object.
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Given a descriptive nominal NP and given X a noun that is a candidate for a proper noun: if the transformation of the apposition X into a relative phrase fails, then X is a proper noun.
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Given X a noun: if X cannot have a predicative function, then X is a proper noun.
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Test:
Given X a noun: if X is a vocative, then X is a proper noun.
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Proper nouns are, from a semantic point of view, transparent or semantically not motivated. This means that no semantic structure underlies them. Nevertheless, proper nouns can be related to the semantic network either by morphosemantic relations (example: `Paris' - `parisien') or via semantic features that they share with common nouns (example: ``vodka: alcoholic drink, ...''). Proper nouns are also related to the semantic network through means of predicates like `s'appeler', ``porter le nom'', `se nommer'. These predicates can also be a common denominator for different proper nouns that denote the same object. Furthermore, the emergence of new proper nouns does not disturb the semantic organisation of existing lexical units, nor the paradigm of proper nouns.
Note that the following tests are not really applicable to common nouns that denote single objects (example: `soleil'), to the names of the days of the week (example: `lundi'), to the names of feast days (example: `Pâques') and to the names for inhabitants (example: `Français'). In contrast to proper nouns, these nouns have an underlying semantic or conceptual structure (`soleil' versus `lune', `terre' versus `ciel', for example), i.e. they are semantically motivated (example: `lundi' means ``jour de la lune''). Names for inhabitants are considered as common nouns because they predicate a property, that is, the membership of a particular group of people. Furthermore, we can say that the weekdays and names of feast days and public holidays are integrated into a conceptual system, that is, the calendar.
Test:
Given X and Y nouns: if ``the synonym of X is Y'' or ``the opposite of X is Y'', etc., fails, then X is a proper noun.
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Given X, Y nouns:
if ``the X are a class of X, X
, etc.'' fails, then
X is a proper noun.
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Note that, for common nouns, the plural form denotes a range of elements that belong to a given class, designated by the noun. The plural form of proper nouns denotes several entities of the same name.
Proper nouns can be defined in extension by the enumeration of semantic sub-classes to which they may belong.