Accession (from Lat. "accedere", to go to, to approach), in law, a method of acquiring property adopted from Roman law (see: "accessio"), by which, in things that have a close connection with or dependence on one another, the property of the principal draws after it the property of the accessory, according to the principle, "accessio cedet principali". Accession may take place either in a natural way, such as the growth of fruit or the pregnancy of animals, or in an artificial way. The various methods may be classified as (i) land to land by accretion or alluvion; (2) moveables to land (fixtures); (3) moveables to moveables; (4) moveables added to by the art or industry of man; this may be by specification, as when a new "species" or thing is made out of a pre-existing thing (e.g. when wine is made out of grapes), or by confusion (when two things are inseparably mixed together and one cannot tell which is the principal and which is the accessory), or commixture, which is the mixing together of substances but where the mixture is separable. In the case of industrial accession ownership is determined according as the natural or manufactured substance is of the more importance, and, in general, compensation is payable to the person who has been dispossessed of his property.

Roman Accession

Accession in relation to land

The general principle was that everything acceded to the land, since the land was the principal.

Buildings (Inaedificatio)

Ownership of the house was considered distinct from ownership of the materials used to make the house. Owners of the materials were permitted to vindicate the materials upon demolition of the house, but the demolition of the house was forbidden by the Twelve Tables.

Where X built on X's land using Y's materials, X owned the house since it acceded to X's land. Y would be capable of laying ONE of two actions if X was in good faith (bonas fides) in using Y's materials, but TWO actions if X was in bad faith (mala fides). These actions were (i) the vindicatio for the materials and (ii) the actio de tigno, which would recoup twice the value of the materials. Additionally, Y would also have an action against a third party if that third party stole the materials.

Where X built on Y's land using X's materials, Y owned the house since it acceded to Y's land. If in bad faith, X was presumed to have made a gift of the materials to Y and would thus have no action. If X was in good faith, and additionally was in legal possession of the house, then any vindicatio brought by Y could be defeated by X using the defence of fraud (exceptio dolus malus) until Y paid X for the materials. It is possible that if X was in good faith, then X could remove items that would not damage the building, e.g. gates. This was known as the ius tolluendi and was possibly established under Justinian.

Buckland, in his Textbook of Roman Law, discusses a third situation where X builds on Y's land using Z's materials. In such a situation, Buckland suggests that in relation to Y, X should be treated as though an XYX situation has occurred, and in relation to Z, as though an XXZ situation has occurred.

Plants and seeds

X's plants and seeds acceded irreversibly to Y's soil once they can taken root, but Y must pay expenses if X is in legal possession, since X will have the exceptio dolus malus against Y's vindicatio.

Rivers and new islands

* Alluvion
* Avulsion

Accession in relation to movables

The accessory accedes to the principal. The debate is generally over which is the principal and which is the accessory. The principal owner owns regardless of good faith, bad faith or consent. Possible tests that could be adopted in deciding this question include:

# Economic value
# Size
# Physical identity
# Relative non-economic value in terms of aesthetic value, or labour, etc.

In Roman Law, there was no consistency. Everything was decided on a casuistic basis. The Physical Identity test was the dominant test, i.e. the principal is that which gives its name to the final product and the accessory is that which has its identity merged and lost in the identity of the other. However, there are a number of special cases with special, and rather idiosyncratic rules, which are as follows:

# Writing (scripture) and painting (pictura)
# Threads and garments (textura)
# Confusio and commixtio

Other meanings

* In the context of "Public International Law" the term "accession" may refer to the act of joining a treaty by a party that didn't take part in its negotiations, as defined by article 15 of the Vienna Convention on the Law of Treaties. It is commonly used as a synonym of "ratification", "acceptance" or "approval" and occurs whether the treaty is "open" to the participation of new member states by mean of an accession provision or whether all the other members so agree. In the first case "accession" implies a "direct participation" of the new member state in the treaty, without any modification of the original agreement. In the latter, "accession" by a new member state implies a new agreement between all member parties. Such as when a new member state joins the European Union (see Enlargement of the European Union).
* In a "historical" or constitutional sense, the term "accession" is applied to the coming to the throne of a dynasty or line of sovereigns or of a single sovereign.
* In a "Real Estate" context, the term "accession" is applied to the act of physically attaching a personal property to land (real property), thus converting it into a fixture. (I.e. Installing an air conditioner in a house.) Opposite of severance.
* "Accession" sometimes likewise signifies consent or acquiescence. Thus, in the "bankruptcy law of Scotland", where there is a settlement by a trust-deed, it is accepted on the part of each creditor by a "deed of accession."
* In a museum, an object is "accessioned" into the collection when it becomes the legal property of the museum, it is assigned a catalogue number, and formal information about its provenance is noted and recorded. (When the museum disposes of the object, it is formally "de-accessioned" from the collection.)
* A book or other object is "accessioned" into a library, similar to the process in a museum.
* A biological sample is "accessioned" into a clinical laboratory when the clinical laboratory establishes control over the sample. Typically an accession number is assigned at this time.
* In the context of bioinformatics, an accession refers to a unique identifier given to a biological polymer sequence (DNA, protein) when it is submitted to a sequence database. See accession number.



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  • accession — [ aksesjɔ̃ ] n. f. • XIIe; lat. accessio I ♦ Le fait d accéder. 1 ♦ Vx Arrivée. 2 ♦ (XVIIIe; empr. angl.) Accession au trône, le fait d y monter. ⇒ avènement. 3 ♦ Fig. et mod. Le fait d accéder, d arriver (à un état, une situation) …   Encyclopédie Universelle

  • accession — ac·ces·sion /ik se shən, ak / n 1: increase by something added; specif: the mode of acquiring property by which the owner of property (as a building, land, or cattle) becomes the owner of an addition by growth, improvement, increase, or labor 2:… …   Law dictionary

  • Accession — • Method of acquiring ownership of a thing arising from the fact that it is in some way added to, or is the fruit of something already belonging to oneself Catholic Encyclopedia. Kevin Knight. 2006. Accession     Accession …   Catholic encyclopedia

  • Accession — Ac*ces sion, n. [L. accessio, fr. accedere: cf. F. accession. See {Accede}.] 1. A coming to; the act of acceding and becoming joined; as, a king s accession to a confederacy. [1913 Webster] 2. Increase by something added; that which is added;… …   The Collaborative International Dictionary of English

  • accession — [n1] something that augments, adds to accretion, addition, augmentation, enlargement, extension, increase, increment, raise, rise; concepts 700,775 accession [n2] coming to power assumption, attainment, inauguration, induction, investment,… …   New thesaurus

  • accession — [ak sesh′ən, əksesh′ən] n. [Fr < L accessio < accessus, ACCESS] 1. the act of coming to or attaining (a throne, power, etc.) [the accession of a new king] 2. assent; agreement 3. a) increase by addition b) an item adde …   English World dictionary

  • Accession — (accessio), das Hinzukommen einer Sache, in der Rechtswissenschaft das zu einem Eigenthum hinzukommende Zubehör an Vortheilen und Lasten, nach dem Grundsatze: wem die Hauptsache gehört, dem gehört auch deren Nebensache. Die Accession ist… …   Herders Conversations-Lexikon

  • Accession — (v. lat. Accessio, Rechtsw.), jede Sache, welche zu einer andern in einem solchen Verhältniß steht, daß sie als Attribut der andern (der Hauptsache) betrachtet wird, deshalb auch von ihr abhängig ist u. ihr Schicksal theilt. Den allgemeinen… …   Pierer's Universal-Lexikon

  • accession — (n.) act of coming to a position, especially of a throne, 1640s, from L. accessionem (nom. accessio) a going to, joining, increase, noun of action from pp. stem of accedere (see ACCEDE (Cf. accede)) …   Etymology dictionary

  • accession — 1 *addition, accretion, increment Antonyms: discard 2 access, attack, *fit, paroxysm, spasm, convulsion Analogous words: see those at ACCESS 2 …   New Dictionary of Synonyms

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