accession

1 ENTRIES FOUND:
accession /ɪkˈsɛʃən/ noun
plural accessions
accession
/ɪkˈsɛʃən/
noun
plural accessions
Britannica Dictionary definition of ACCESSION
formal
1 
[noncount] : the act or process by which someone rises to a powerful and important position — often + to
2 
[count] : something that is added to a collection at a museum