1. (noun)accession a process of increasing by addition (as to a collection or group) Synonyms: addition, access, admittance, assenting, admission, rise to power, entree
2. (noun)accession (civil law) the right to all of that which your property produces whether by growth or improvement Synonyms: addition, access, admittance, assenting, admission, rise to power, entree
3. (noun)accession, addition something added to what you already have Synonyms: add-on, improver, admission, increase, summation, entree, admittance, rise to power, addition, accession, access, assenting, plus, gain
4. (noun)accession, assenting agreeing with or consenting to (often unwillingly) Synonyms: admission, entree, admittance, rise to power, addition, accession, access, assenting
5. (noun)entree, access, accession, admission, admittance the right to enter Synonyms: main course, entrance, entryway, admission price, admission charge, access code, entrance fee, memory access, admission fee, approach, rise to power, entrance money, entranceway, admission, accession, entree, access, assenting, price of admission, entry, admittance, addition
6. (verb)accession, rise to power the act of attaining or gaining access to a new office or right or position (especially the throne) Synonyms: admission, entree, admittance, rise to power, addition, accession, access, assenting
7. (verb)accession make a record of additions to a collection, such as a library
Synonyms for accession 
