Noun
the act of attaining or gaining access to a new office or right or position (especially the throne); "Elizabeth''s accession in 1558"

Noun
the right to enter

Noun
agreeing with or consenting to (often unwillingly); "accession to such demands would set a dangerous precedent"; "assenting to the Congressional determination"

Noun
something added to what you already have; "the librarian shelved the new accessions"; "he was a new addition to the staff"

Noun
(civil law) the right to all of that which your property produces whether by growth or improvement

Noun
a process of increasing by addition (as to a collection or group); "the art collectin grew through accession"

Verb
make a record of additions to a collection, such as a library

n.
A coming to; the act of acceding and becoming joined; as, a king's accession to a confederacy.

n.
Increase by something added; that which is added; augmentation from without; as, an accession of wealth or territory.

n.
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.

n.
The act by which one power becomes party to engagements already in force between other powers.

n.
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.

n.
The invasion, approach, or commencement of a disease; a fit or paroxysm.

Accession

The only accession which the Roman empire received was the province of Britain.

A coming to; the act of acceding and becoming joined; as, a king's accession to a confederacy.