D defs.my
Entry 1 sense Webster, 1913

Vigilant

/vĭj'-əl-ənt/ · Vig·i·lant · IPA /ˈvɪd͡ʒɪlənt/
01 a. Attentive to discover and avoid danger, or to provide for safety; wakeful; watchful; circumspect; wary.
  1. 1.
    Attentive to discover and avoid danger, or to provide for safety; wakeful; watchful; circumspect; wary.
    “Sirs, take your places, and be vigilant.” Shak.