assession

A sitting beside or near; especially as a participant in an official proceeding such as a meeting of an organization or a court case; an official membership or seat.

The act of assessment.

(historical) An official review and recognition of the feudal distribution of land, including the tenants living on that land and the terms of their holdings, which was held every seven years (the term of each tenant's lease).

Misspelling of accession. [A coming to; the act of acceding and becoming joined.]