/ˈɒktɛnəri/ OH-ten-uh-ree

Definitions

1. adjective

related to or consisting of eight parts or units

“The octenary rhythm in the poem added to its musical quality.”

2. noun

a period of eight years, especially one that is significant or memorable

“She celebrated her octenary with a grand party.”

3. noun

the eighth day after birth, traditionally observed as a significant milestone

“The octenary celebration marked the beginning of a new chapter in the baby’s life.”