UNDERTENANCY Meaning of UNDERTENANCY in English ˈ ̷ ̷ ̷ ̷ˌ ̷ ̷ ̷ ̷ ̷ ̷ nounEtymology: under (III) + tenancy : a tenancy held from a tenant Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012