1. (noun) accession
a process of increasing by addition (as to a collection or group)
"the art collection grew through accession"
2. (noun) accession
(civil law) the right to all of that which your property produces whether by growth or improvement
3. (noun) accession, addition
something added to what you already have
"the librarian shelved the new accessions"; "he was a new addition to the staff"
4. (noun) accession, assenting
agreeing with or consenting to (often unwillingly)
"accession to such demands would set a dangerous precedent"; "assenting to the Congressional determination"
5. (noun) entree, access, accession, admission, admittance
the right to enter
6. (verb) accession, rise to power
the act of attaining or gaining access to a new office or right or position (especially the throne)
"Elizabeth's accession in 1558"
7. (verb) accession
make a record of additions to a collection, such as a library
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Definition of 'accession' 
