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acuity

noun
🔊/əˈkjuːəti/
🔊/əˈkjuːəti/
[uncountable] (formal)
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  1. the ability to think, see or hear clearly（思维、视力、听力的）敏度，敏锐
    • a child’s visual acuity儿童的视力
    Word Originlate Middle English: from Old French acuité or medieval Latin acuitas, from Latin acuere ‘sharpen’ from acus ‘needle’.