1) Mathematical terminology 
Herbert Breger (1994) wrote: `I want to put forward my hypothesis: Fermat used the word `adaequare` in the sense of `to put equal` ... In a mathematical context, the only difference between `aequare` and `adaequare` seems to be that the latter gives more stress on the fact that the equality is achieved.` (Page 197f.) John Stillwell (Sti...