What do we call a period of 12 years? Answer: Duodecennial. Explanation: Duodecennial word can be used as alternatively for a gap once in 12 years .
Is a decade 12 or 10 years? A decade is a period of 10 years. The word is derived (via French and Latin) from the Ancient Greek: δεκάς, romanized: dekas, which means a group of ten. Decades may describe any ten-year period, such as those of a person’s life, or refer to specific groupings of calendar years.
Is there a word for 15 years? of or relating to a period of 15 years or the 15th occurrence of a series, as an anniversary.
What is 10 year period called? decade. / (ˈdɛkeɪd, dɪˈkeɪd) / noun. a period of ten consecutive years.