Lewis Short
perspĭcācĭtas (noun F) : perspicax
* Sharp-sightedness, discernment, discrimination: qui nullā perspicacitate, sine innocentium sontiumque differentiā,...damnarunt,Amm. 15, 3, 2; cf.: perspicacitas, τὸ συνοπτικόν, Gloss. Lab.
Charlton T. Lewis, Charles Short, A Latin Dictionary