Accession

the act of coming into the possession of a right, t-tle, office, etc.:
accession to the throne.
an increase by something added:
an accession of territory.
something added:
a list of accessions to the college library.
law. addition to property by growth or improvement.
consent; agreement; approval:
accession to a demand.
international law. formal acceptance of a treaty, international convention, or other agreement between states.
the act of coming near; approach.
an attack or onset, as of a disease.
to make a record of (a book, painting, etc.) in the order of acquisition.
to acquire (a book, painting, etc.), especially for a permanent collection.
contemporary examples

an accession agreement with europe represented a chance for this struggling, isolated nation to become part of the modern world.
ukraine’s eurolution is a pr g-dsend for the struggling e.u. vijai maheshwari december 10, 2013

after eu accession, the donor landscape for watchdogs and activist groups fundamentally changed for countries in eastern europe.
roma children face segregation in eu schools amana fontanella-khan march 7, 2014

feinstein explicitly called for one in her remarks, specifically demanding russia’s accession.
will we go to war in syria? ali gharib april 25, 2013

“he was told to eff-off on more than one accession by the surfers here,” mr robinson said in a phone call today.
young prince charles was told to ‘eff-off’ by british surfers for drop-ins tom sykes june 13, 2012

the disputes have been major stumbling blocks for croatia’s accession into both nato and the european union.
half of this bar is in slovenia, the other half is in croatia jeff campagna january 5, 2014

historical examples

the three differences relate to power, tenure, and manner of accession.
the measurement of intelligence lewis madison terman

all this happened now, for the first time since their accession to wealth.
little dorrit charles d-ckens

herodotus (3, 89) places this arrangement into satrapies immediately after the accession.
the history of antiquity max duncker

the only change in it that they could notice was an accession of alertness.
white fang jack london

indeed he zealously promoted it before his accession to the throne.
nineteen centuries of drink in england richard valpy french

noun
the act of entering upon or attaining to an office, right, condition, etc
an increase due to an addition
an addition, as to a collection
(property law)

an addition to land or property by natural increase or improvement
the owner’s right to the increased value of such land

(international law) the formal acceptance of a convention or treaty
agreement; consent
a less common word for access (sense 2)
verb
(transitive) to make a record of (additions to a collection)
n.

“act of coming to a position,” especially of a throne, 1640s, from latin accessionem (nominative accessio) “a going to, joining, increase,” noun of action from past participle stem of accedere (see accede).