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Wiktionary
octal

a. (context arithmetic computing English) Concerning numbers expressed in octal or mathematical calculations performed using octal. n. (context arithmetic computing uncountable English) The number system that uses the eight digits 0, 1, 2, 3, 4, 5, 6, 7.

WordNet
octal

adj. of or pertaining to a number system having 8 as its base; "an octal digit"

Wikipedia
Octal

The octal numeral system, or oct for short, is the base-8 number system, and uses the digits 0 to 7. Octal numerals can be made from binary numerals by grouping consecutive binary digits into groups of three (starting from the right). For example, the binary representation for decimal 74 is 1001010. Two zeroes can be added at the left: , corresponding the octal digits , yielding the octal representation 112.

In the decimal system each decimal place is a power of ten. For example:

74 = 7 × 10 + 4 × 10

In the octal system each place is a power of eight. For example:

112 = 1 × 8 + 1 × 8 + 2 × 8

By performing the calculation above in the familiar decimal system we see why 112 in octal is equal to 64+8+2 = 74 in decimal.

The octal multiplication table

×

1

2

3

4

5

6

7

10

1

1

2

3

4

5

6

7

10

2

2

4

6

10

12

14

16

20

3

3

6

11

14

17

22

25

30

4

4

10

14

20

24

30

34

40

5

5

12

17

24

31

36

43

50

6

6

14

22

30

36

44

52

60

7

7

16

25

34

43

52

61

70

10

10

20

30

40

50

60

70

100

Usage examples of "octal".

His imagination was gibbering with images of the pursuit Sam and Octal were putting together behind him.

Sam and Octal, unintelligible bursts of digital code with a curious echo effect.

Their thirty-two was surrounded by twenty-one, twenty-two, forty-one, and forty-two in the octal system.

I think this little chap is an octal pointthe equivalent of a decimal point.

Sulu said, punching an octal code into his programmer with rapid strokes of his sinewy fingers.

Well, the question is: Define the octal number system and give me the decimal equivalent of the octal numbers 05726 and 12438.

Gnashing my mandibles with glee, I followed him through with an extra-special reverse somersault with octal hitchkick.

Suppose, for the sake of argument, the Octal Millennialists had double-checked the portents, counted up by eight again and discovered they had made a mistake in their base-eight calculations of the date for Judgment Day.

Pieces are there, like the way you count in octal instead of decimal, or the binary aspects of your world: two suns, two moons, two sets of opposing fingers.

Their number system was octal, suggesting perhaps four-fingered hands.

Ultimately, the essay postulated, the only computer a human would need would be an octal interface and the use of his own brain.

For over an hour he stared at the boxes and circles used to exhibit the flow of data, the speed of perception in the various skins, and the protocols for translation into octal code.

Since their base number system is octal, the range for the comparatives is between one and seven.

Cummings, the freshman math teacher of the octal number incident –.

Cummings, the freshman math teacher of the octal number incident - stopped calling on him, for fear that he'd mock them and their own limitations.