1. A coming to; the act of acceding and becoming joined; as, a kings accession to a confederacy.
2. Increase by something added; that which is added; augmentation from without; as, an accession of wealth or territory. The only accession which the roman empire received was the province of Britain. (Gibbon)
3. A mode of acquiring property, by which the owner of a corporeal substance which receives an addition by growth, or by labour, 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. The act by which one power becomes party to engagements already in force between other powers.
4. 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.
5. (Science: medicine) The invasion, approach, or commencement of a disease; a fit or paroxysm.
Synonym: increase, addition, augmentation, enlargement.
Origin: L. Accessio, fr. Accedere: cf. F. Accession. See Accede.