ACCESS'ION, noun [Latin accessio.]
1. A coming to; an acceding to and joining; as a king's accession to a confederacy.
2. Increase by something added; that which is added; augmentation; as an accession of wealth or territory.
3. In 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 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.
4. The act of arriving at a throne, an office, or dignity.
5. That which is added.
The only accession which the Roman Empire received, was the province of Britain.
6. The invasion of a fit of a periodical disease, or fever. It differs from exacerbation. accession implies a total previous intermission, as of a fever; exacerbation implies only a previous remission or abatement of violence.