70s
A period of 100 years.
It is a span of time defined for the purposes of chronology or historiography.
All of the people born and living at about the same time, regarded collectively.
80s
It was a decade of the Gregorian calendar that began on January 1, 1980, and ended on December 31, 1989.
A period of one thousand years.
It was a decade of the Gregorian calendar that began on January 1, 1970, and ended on December 31, 1979.
A period of ten years.
A period of twenty-five years.
A period of human life, measured by years from birth,
a decade
The nineteen-eighties (1980s)
The nineteen-seventies (1970s)
A millenium
An age
A quarter-century
A century
Same as nineteen-eighties (1980s)
A generation
Same as nineteen-seventies (1970s)
An era
