What is the meaning of Fortis?
Strongly articulated (of a consonant), hence voiceless.
A fortis consonant.
strong, powerful
firm, resolute, steadfast, stout
courageous, brave
manly, mannish (answering to the Greek ἀνδρεῖος) (clarification of this definition is needed)
genitive singular of fors
Source: wiktionary.org