noun
: a period of time during which a culture, language, or group of languages has been undergoing independent genetic development
a language with a time depth of 5000 years
noun
: a period of time during which a culture, language, or group of languages has been undergoing independent genetic development
a language with a time depth of 5000 years
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012