say it: uh-LURT-nuhs
alertness is a noun meaning "the process of paying close and continuous attention". It carries 3 recorded senses.
the process of paying close and continuous attention
“wakefulness, watchfulness, and bellicosity make a good hunter”
“vigilance is especially susceptible to fatigue”
a state of readiness to respond
“alerting was indicated by the desynchronization of the EEG”
lively attentiveness
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for alertness come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.