octal

adjective

1. Also octonary. of or relating to the number system with base 8, employing the numerals 0 through 7.
2. relating to or encoded in an octal system, especially for use by a digital computer.
3. (of an electronic device) having eight pins in its base for electrical connections.

noun

4. octonary(def 6).

1. Relating to a number system having a base of 8. Each place in an octal number represents a power of 8. Octal notation has often been used in computer programming because three-digit binary numbers are readily converted into one-digit octal numbers from 0 to 7.