accession

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

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

(law) 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).

(law) The 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.

(medicine) The 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.

(Scotland) Complicity, concurrence or assent in some action.