alertness

名词 n.
中文释义
美 /əˈlɝt.nəs/

英文释义

名词 n.
  1. The quality of being alert or on the alert. uncountable,usually
    — THE human body was meant to have a midafternoon nap, according to a new consensus among sleep researchers who are studying the biological rhythms of sleep and alertness.

词形变化

alertnesses plural

词源

Etymology tree
English alert
Proto-Germanic *-inōną
Proto-Indo-European *-dyé-
Proto-Germanic *-atjaną
Proto-Indo-European *-tus
Proto-Germanic *-þuz
Proto-Germanic *-assuz
Proto-Germanic *-inassuz
Proto-West Germanic *-nassī
Old English -nes
Middle English -nesse
English -ness
English alertness
From alert + -ness.
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