- pertaining to the number 8.
- consisting of eight.
- proceeding by eight.
- octal(def 1).
noun, plural oc·to·nar·ies.
- a group of eight; an ogdoad.
- Also octal. Prosody. a stanza of eight lines.
- a number in an octonary system.
- relating to or based on the number eight
noun plural -naries
- prosody a stanza of eight lines
- a group of eight