decade
UK: ˈdɛkeɪd | US: ˈdɛkeɪd
n. a period of ten years
n. (loosely) any group or series of ten
The word decade entered English in the 15th century via Old French decade, from Late Latin decas (a group of ten), which traces back to Greek dekas (δεκάς). The Greek root deka (δέκα) means "ten," reflecting its use in systems like the decimal base or the ten-year divisions in calendars. The suffix -ade evolved to denote a countable unit, solidifying the modern meaning of a ten-year span.
The world changed dramatically over the past decade.
She spent a decade researching ancient civilizations.
The 1960s was a turbulent decade in global politics.
The project aims to reduce emissions by 2030, completing a decade of effort.
His career peaked in the third decade of the 20th century.