Vigilant/ˈvɪdʒɪlənt/ Definition 1 of 1Pro Tip 1/3Safety Contexts Often used in safety contexts where attention can prevent danger or harm. Be vigilant when crossing the street. Pro Tip 2/3Stay Prepared Implies readiness to act if something unusual happens, not just observing. Vigilant citizens reported the suspicious activity. Pro Tip 3/3Extended Vigilance Can suggest consistent vigilance over a period of time, not just momentary. Scientists must remain vigilant in their research for accuracy.