D defs.my
Entry 5 senses Webster, 1913

Accession

/ək-sĕsh'-ən/ · Ac·ces·sion · IPA /ækˈsɛʃ.ən/
01 n. A coming to; the act of acceding and becoming joined; as, a king's accession to a confederacy.
  1. 1.
    A coming to; the act of acceding and becoming joined; as, a king's accession to a confederacy.
  2. 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. 3.
    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.(Law)
  4. 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. 5.
    The invasion, approach, or commencement of a disease; a fit or paroxysm.(Med.)