Accession n. : A coming to; the act of acceding and becoming joined; as, a king's accession to a confederacy.

Accession n. : Increase by something added; that which is added; augmentation from without; as, an accession of wealth or territory.

Accession n. : A mode of acquiring property, by which the owner of a corporeal substance which receives an addition by growth, or by labor, has a right to the part or thing added, or the improvement (provided the thing is not changed into a different species). Thus, the owner of a cow becomes the owner of her calf.

Accession n. : The act by which one power becomes party to engagements already in force between other powers.

Accession n. : The act of coming to or reaching a throne, an office, or dignity; as, the accession of the house of Stuart; -- applied especially to the epoch of a new dynasty.

Accession n. : The invasion, approach, or commencement of a disease; a fit or paroxysm.

Example:
What has been the impact on China of the Accession to the WTO?

Taxonomy
Accession, accessory, relation to, accession number, moveables, good faith, accession provision, free encyclopedia, museum, Roman Law, ownership, bad faith, vindicatio, new member, member state, Physical identity, the European Union, deed.

Defination from the web:
Accession (from Lat. ... 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. ... In the case of industrial accession ownership is determined according as the natural or manufactured substance is of the ...