Where does “octonary” come from?

octonary (English) comes from Latin octōnārius, from Latin -ārius, from Proto-Italic *-āzios — Forms relational adjectives to nouns (and rarely numerals).

octonary (English): Of eighth rank or order; Consisting of eight...

Definitions

Of eighth rank or order; Consisting of eight...

Ancestry of “octonary”, step by step

Step	Language	Word	Meaning
1	Latin	octōnārius	containing or consisting of eight things
2	Latin	-ārius	er
3	Proto-Italic	*-āzios	Forms relational adjectives to nouns (and rarely numerals)

Every word from Proto-Italic *-āzios →Every word from Latin -ārius →Every word from Latin octōnārius →