accession
/ækˈsɛʃ.ən/
Meaning 1
The act of coming into possession or power.
“The accession of the new leader surprised everyone.”Add to my deck
Meaning 2
a formal agreement or addition
“The accession of the new member was celebrated.”Add to my deck
Meaning 3
formal agreement to join an organization
“The country signed the accession to the treaty.”Add to my deck