vigil /ˈvɪd͡ʒəl/noun 4verb 1forms 5 noun4 •An instance of keeping awake during normal sleeping hours, especially to keep watch or pray.I saw her head drooped upon her hand; her whole attitude expressing that profound depression, whose lonely vigil wastes the midnight in a gloomy watch, which yet hopes for nothing at its close. — 1834 •A period of observation or surveillance at any hour.His dog kept vigil outside the hospital for eight days while he was recovering from an accident. •A quiet demonstration in support of a cause.The protesters kept vigil outside the conference centre in which the party congress was being held. •The eve of a religious festival in which staying awake is part of the ritual devotions. verb1 •To participate in a vigil. formsvigiled · vigilled · vigiling · vigilling · vigils