I searched and the only useful explanation i found:

Table of small numbers

N-ary:

• Nullary means 0-ary.

• Unary means 1-ary.

• Binary means 2-ary.

• Ternary means 3-ary.

• Quaternary means 4-ary.

• Quinary means 5-ary.

• Senary means 6-ary.

• Septenary means 7-ary.

• Octary means 8-ary.

• Nonary means 9-ary.

Hope this helps.

The arity of a function or operation is the number of arguments or operands that the function takes.

N-ary:

• Nullary means 0-ary.

• Unary means 1-ary.

• Binary means 2-ary.

• Ternary means 3-ary.

• Quaternary means 4-ary.

• Quinary means 5-ary.

• Senary means 6-ary.

• Septenary means 7-ary.

• Octary means 8-ary.

• Nonary means 9-ary.

Hope this helps.