Definition of accessional in English:

accessional

adjective

  • Of the nature of an increase or augmentation; additional; supplementary; accessory.

Origin

Mid 17th century; earliest use found in Thomas Browne (1605–1682), physician and author. From accession + -al.

Pronunciation:

accessional

/əkˈsɛʃ(ə)n(ə)l//əkˈsɛʃən(ə)l//akˈsɛʃ(ə)n(ə)l/