The term 'accession' can refer to a variety of related concepts, including the ADDITION of something (8 letters: ADDITION), the ADMISSION of someone or something (9 letters: ADMISSION), the ASSUMPTION of a role or responsibility (10 letters: ASSUMPTION), enrollment in a program or school (10 letters: ENROLLMENT), the RECEIPT of something (7 letters: RECEIPT), the ACCRETION of something (9 letters: ACCRETION), the AUGMENTATION of something (12 letters: AUGMENTATION), the INAUGURATION of something (12 letters: INAUGURATION), the INSTALLATION of something (12 letters: INSTALLATION), the ATTAINMENT of something (10 letters: ATTAINMENT), a RISE in something (4 letters: RISE), ASSENT to something (6 letters: ASSENT), a RAISE in something (5 letters: RAISE), the ARRIVAL of something (7 letters: ARRIVAL), the ESTABLISHMENT of something (13 letters: ESTABLISHMENT), the ENLARGEMENT of something (11 letters: ENLARGEMENT), the ACCEPTANCE of something (10 letters: ACCEPTANCE), AGREEMENT with something (9 letters: AGREEMENT), accedence to something (9 letters: ACCEDENCE), and the INFLUX of something (6 letters: INFLUX).