In older algebra textbooks for high school (mainly 19th century) four properties of ratio and proportions were used. The properties were Invertendo, Alternendo, Componendo, and Dividendo. This terminology has vanished in most textbooks.
I could never locate these words in any unabridged English dictionaries (Oxford's multivolume dictionary, as well as Webster's). Most likely these are Latin words.
Does anyone know the literal meanings and English equivalents of these four words? Intuitively, they make sense but what is the word form (verb, adjective, noun?). https://brilliant.org/wiki/componendo-and-dividendo/