/ ˌpɜːspɪˈkeɪʃəs; NAmE ˌpɜːrs-/ adjective
( formal ) able to understand sb/sth quickly and accurately; showing this :
a perspicacious remark
► per·spi·ca·city / ˌpɜːspɪˈkæsəti; NAmE ˌpɜːrs-/ noun [ U ]
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WORD ORIGIN
early 17th cent.: from Latin perspicax , perspicac- seeing clearly + -acious .