Meaning of DECADE in English

[de.cade] n [ME, fr. MF decade, fr. LL decad-, decas, fr. Gk dekad-, dekas, fr. deka] (15c) 1: a group or set of 10: as a: a period of

10. years b: a division of the rosary that consists primarily of

10. Hail Marys

2: a ratio of

10. to 1: order of magnitude -- adj

Merriam-Webster English vocab.      Английский словарь Merriam Webster.