decade (EN)
noun

noun “decade”

sg. decade, pl. decades
  1. a period of ten years, especially one that starts with a year ending in 0 and ends with a year ending in 9
    She celebrated a decade of working at the company with a big party.
  2. in Roman Catholicism, a set of prayers on a rosary that includes an Our Father, ten Hail Marys, and usually ends with a Glory Be and sometimes the Fatima Prayer
    During her morning prayers, Maria devotedly recited three decades of the rosary, feeling a deep sense of peace with each repetition.