noun the invasion, approach, or commencement of a disease; a fit or paroxysm.
2. accession ·noun a coming to; the act of acceding and becoming joined; as, a king's accession to a confederacy.
3. accession ·noun the act by which one power becomes party to engagements already in force between other powers.
4. accession ·noun increase by something added; that which is added; augmentation from without; as, an accession of wealth or territory.
5. accession ·noun 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.
6. accession ·noun 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.