Definition of perspicacy in English:

perspicacy

noun

rare
  • Perspicacity.

Origin

Early 17th century; earliest use found in Ben Jonson (?1573–1637), poet and playwright. From post-classical Latin perspicacia insight, discernment (late 2nd or early 3rd cent. in Tertullian; frequently 1125–1620 in British sources) from classical Latin perspicāc-, perspicāx discerning + -ia; compare -acy.

Pronunciation

perspicacy

/ˈpəːspɪkəsi/