Word derivation for "secret" :
Basque = sekretu, Finnish = salaisuus
Miresua = sekasus
This is a new word. The Basque word may be a borrowed word, or may be derived from Latin.
I found the word secret once in Alice's Adventures in Wonderland, it's in a verse read by the White Rabbit at the court of justice.
"Don't let him know she liked them best,
For this must ever be
A secret, kept from all the rest,
Between yourself and me."