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perspicacity

/ˌpɜː.spɪˈkæs.ɪ.ti/ noun

In Latin: perspicācitās Wiktionary

Origin

From Middle French perspicacité (whence -acity) or directly from Latin perspicācitās (“sharpsightedness, discrimination”), from perspicāx (“sharp-sighted”), from perspicio, from per- + specio, "see through (something)".

From Wiktionary, via Kaikki.org (CC BY-SA)