accession (n.)

1580s, "that which is added," also "act of acceding" (by assent, to an agreement, etc.), from Latin accessionem (nominative accessio) "a going to, approach; a joining; increase, enlargement," noun of action from past-participle stem of accedere "approach, enter upon" (see accede). From 1640s as "act of coming to a position or into possession," especially in reference to a throne. Related: Accessional.

Origin and meaning of accession

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Definitions of accession from WordNet
accession (n.)
a process of increasing by addition (as to a collection or group);
the art collection grew through accession
accession (n.)
(civil law) the right to all of that which your property produces whether by growth or improvement;
accession (n.)
something added to what you already have;
the librarian shelved the new accessions
Synonyms: addition
accession (n.)
agreeing with or consenting to (often unwillingly);
accession to such demands would set a dangerous precedent
Synonyms: assenting
accession (n.)
the right to enter;
accession (n.)
the act of attaining or gaining access to a new office or right or position (especially the throne);
Elizabeth's accession in 1558
Synonyms: rise to power
accession (v.)
make a record of additions to a collection, such as a library;