1. (powers of) concentration; ability to concentrate
Wikipedia definition
2. AlertnessAlertness is the state of paying close and continuous attention, being watchful and prompt to meet danger or emergency, or being quick to perceive and act. It is related to psychology as well as to physiology. A lack of alertness is a symptom of a number of conditions, including narcolepsy, attention deficit disorder, chronic fatigue syndrome, depression, Addison's disease, or sleep deprivation.
Read “Alertness” on English Wikipedia
Read “集中力” on Japanese Wikipedia
Read “Alertness” on DBpedia


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