LATIN DICTIONARYLexicon Latīnum
adverb

fortiter

fortiter (comparative fortius, superlative fortissimē)
Classical[ˈfɔr.tɪ.tɛr]Ecclesiastical[ˈfɔr.ti.ter]

Meaning

  1. strongly, powerfully
  2. bravely, boldly

In the readers how our graded readers gloss it

Lewis & Short A Latin Dictionary, 1879

fortĭter, adv., v. fortis
I. fin.

Origins

Proto-Indo-European *-teros? Latin -ter Latin fortiter From fortis (“strong, mighty”) + -ter.