accession

A coming to; the act of acceding and becoming joined.

“a king's accession to a confederacy”

Increase by something added; that which is added; augmentation from without.

legalA 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).

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

The act of coming to or reaching a throne, an office, or dignity.

“her accession to the throne”

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

Agreement.

Access; admittance.

A group of plants of the same species collected at a single location, often held in genebanks.

ScotlandComplicity, concurrence or assent in some action.

A process of increasing by addition (as to a collection or group)

“the art collection grew through accession”

Something added to what you already have

“the librarian shelved the new accessions”

“he was a new addition to the staff”

Agreeing with or consenting to (often unwillingly)

“accession to such demands would set a dangerous precedent”

“assenting to the Congressional determination”

The act of attaining or gaining access to a new office or right or position (especially the throne)

“Elizabeth's accession in 1558”

To make a record of (additions to a collection).