Words

I don't know that this exactly belongs in this blog, but I like it very much and I need a place to record it, so here goes . . . .

Q:  What comes after primary, secondary, tertiary?

A: The sequence continues with quaternary, quinary.   After that, it continues even further with senary, septenary,   octonary, nonary, and denary. Words also exist for `twelfth order' (duodenary) and   `twentieth order' (vigenary).

(With thanks to Ask Oxford)