Alertness
Pronunciation : A*lert"ness
Part of Speech : n.
Definition : Defn: The quality of being alert or on the alert; briskness; nimbleness; activity.
Source : Webster's Unabridged Dictionary, 1913
Merriam-Webster's Everyday Language Reference Set: Includes: The Merriam-Webster Dictionary, The Merriam-Webster Thesaurus, and The Merriam-Webster Vocabulary Builder