vig·i·lance /ˈvɪdʒɪləns/ n. 1. 警戒；警觉，警惕(性) exercise vigilance 实行警戒 constant vigilance against the spread of disease (over the population) 对疾病传播(对人口问题)的一贯警觉 The cat watched the mousehole with vigilance. 猫警觉地注视着鼠洞。 2. (对刺激的)敏感，灵敏 the vigilance of a person's nerves 人的神经的敏感 3. 【医】失眠症，警醒症