Definition of alertness in English:

alertness

Syllabification: a·lert·ness
Pronunciation: /əˈlərtnis
 
/

noun

The quality of being alert: nothing could escape the steel trap of my alertness a lack of mental alertness
More example sentences
  • Travelers to such destinations practice extra alertness, precaution and prudence.
  • Anything related to Taiwan's survival should be heeded with special alertness.
  • Fire has caused £30,000 damage to a woollen waste mill, and it could have been worse but for the alertness of a teenage girl.

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