Lexes
Lex's "Carbon Copy"
Lex Roots: Attempt 1, Part 2
Math Era, but with a twist...

Physics?
400

Incapable of making mistakes or being wrong.

What is Infallible?

400

Another word for omnipresent.

What is Ubiquitous?

400

From the greek root philanthrōpos (meaning man-loving), this means to seek to promote the welfare of others, especially by donating money to good causes.

What is Philanthropic?

400

Some of the earliest mathematicians were Pythagoras and his followers, who was the inventor of the Pythagorean Theorem and also lived in this century.

What is the (V)th Century?

400

Before this element can be used in a fission reactor, it has to be enriched to increase the level of its 235 isotope. 

(Answer format: Element, Roman Numeral for Atomic Number)

What is Uranium, XCII?

800

(Of a remark, opinion, or idea) overused and consequently of little import.

What is Trite?

800

An abundance of something, from the word plēthein.

What is Plethora?

800

From the Latin root pars, meaning part, this also means a strong supporter of something.

What is Partisan?

800

Euclid was one of the first great Greek mathematicians. He laid the framework for our formal understanding of geometry, and also lived during this BC year.

What is (CCC) BC

800

The first shell around a nucleus can have a maximum of this many electrons.

What is 2?

1200

Not being what it purports to be.

What is Spurious?

1200

Contemplation of something, an example would be: "we __________ the existence of the universe".

What is Ruminate?

1200

From the Latin roots Prae and Dilligare, this also is a bias in favor of something

What is Predilection?

1200

With Newton's and Leibniz's invention of calculus during this late century, mathematics was able for the first time to systematically describe how things change across space and time.

What is the (XVI)th Century?

1200

Daily Double

The name of this theory is from viewing sub-atomic particles as 1-dimensional objects, not as 0-dimensional points.

1600

(especially of a person or speech) Vehement or clamorous.

What is Vociferous?

1600

Daily Double

From the Latin root loqui, another synonym for it is garrulous.

1600

From the root calx/calc (meaning heel), this means having an obstinately uncooperative attitude toward authority or discipline.

What is Recalcitrant?

1600

Johannes Kepler was a gifted geometer who applied his mathematical abilities to solidify our understanding of the solar system with his "Kepler Laws". He also was born in this century.

What is the (XV)th Century?

1600

The special theory of this says that the speed of light in a vacuum is a universal constant.

What is Relativity?

2000

Kept secret, especially because it would not be approved of.

What is Surreptitious?

2000

This word is a synonym for Truculent and means 'to demonstrate aggression and willingness to fight'.

What is Bellicose?

2000

From the Latin roots Verus and Similis.

What is Verisimilitude?

2000

Thomas Bayes provided one of the most important tools used in probability theory and statistics, and also lived for this many years (rounded to the nearest 10).

What is LX amount of years?

2000

The term first used by James Watt for a unit equivalent to 550 foot-pounds of work per second.

What is Horsepower?