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What is the oldest history in the world? The span of recorded history is roughly 5,000 years, beginning with the Sumerian cuneiform script.

Is there a word for every 3 years? Definition of triennial occurring every three years.

Is there a word for a 5 year period? “Quinquennial.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/quinquennial.

What is bigger than a millennium? The answer is Eon. Eon often refers to a span of one billion years. Show activity on this post.

What is another word for 1000000000 years? Some terms referenced do have year values assigned to them (Epoch at 1,000,000 years and Aeon at 1,000,000,000 years) but common usage relates to geological time periods which are not consistent in length.

What is a 100000 year period called? Decade: Ten (10) years. Century: One hundred (100) years. Millennium: One thousand (1,000) years.

What is a person in his 90’s called? Definition of nonagenarian : a person whose age is in the nineties.

What is considered your mid 20’s? Early is 20-23, 24-26 is mid, and 27-29 is late. Congrats, you’re in your mid-20s.

What units are light years? light-year, in astronomy, the distance traveled by light moving in a vacuum in the course of one year, at its accepted velocity of 299,792,458 metres per second (186,282 miles per second). A light-year equals about 9.46073 × 1012 km (5.87863 × 1012 miles), or 63,241 astronomical units.

What is the 10 unit of time?
Units of Time

minute
60 seconds

hour
60 minutes, or 3,600 seconds

day
24 hours, or 86,400 seconds

week
7 days, or 604,800 seconds