Accession

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See also: Accession (DS9 episode)

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 wine is made out of grapes, or by confusion, or commixture, which is the mixing together of liquids or solids, respectively. 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.

[edit] 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 art. 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 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.)
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.