Yuga

A yuga, in Hinduism, is generally used to indicate an age of time.
In the "Rigveda", a "yuga" refers to generations, a long period, a very brief period, or a yoke (joining of two things). In the "Mahabharata", the words "yuga" and "kalpa" (a day of Brahma) are used interchangeably to describe the cycle of creation and destruction.
The names "Yuga" and "Age" commonly denote a (pronounced "Chatur Yuga"), a cycle of four world ages, e.g. the "Surya Siddhanta" and "Bhagavad Gita" (part of the "Mahabharata"), unless expressly limited by the name of one of its minor ages: "Krita (Satya) Yuga", "Treta Yuga", "Dvapara Yuga", or "Kali Yuga".
Etymology.
Yuga () means "a yoke" (joining of two things), "generations", or "a period of time" such as an age, where its archaic spelling is yug, with other forms of yugam, ', and yuge, derived from yuj (), believed derived from ""' (Proto-Indo-European: 'to join or unite').
In the Latin language, juga or jug is used from the word jugum, which means "a yoke used to connect two oxen" (e.g. "cali-juga" = "kali-yuga").