Ac-çēs'sion, n.
(-sĕsh'un), n. [Lat. accessio, Fr. accession. See ACCEDE.]
Sense 1. The act of acceding and becoming joined; as, a king's accession to a confederacy.
Sense 2. Increase by something added; that which is added; augmentation; as, an accession of wealth or territory.
The only accession which the Roman empire received was the province of Britain. Gibbon.
Sense 3. (Law.) 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; but the owner of grapes does not become the owner of the wine made out of them by another. Kent.
Sense 4. The act of arriving at a throne, an office, or dignity; as, the accession of the house of Stuart;—in reference to governments, applied rather to the epoch of a new dynasty, than to individual kings, who are said to succeed to a throne.
Sense 5. (Med.) The invasion, approach, or commencement of a disease.
Synonyms—Increase; addition; augmentation; enlargement.