1. metron -
Greek root - measure
Definitions from

2. meter
noun
the base unit of length in the International System of Units
FYI – a meter is equal to the distance traveled in a vacuum by light in 1/299,792,458 second or to about inches
It is also very nearly 1 ten millionth the distance from the equator to the poles.

3. meter- noun - the base unit of length in the metric system (International System of Units)
-an instrument for measuring, esp. one that automatically measures and records the quantity of something, as of gas, water, miles, or time, when it is activated.
FYI – a meter is equal to the distance traveled in a vacuum by light in 1/299,792,458 second or to about inches
It is also very nearly 1 ten millionth the distance from the equator to the poles.

4. Mystery Word- branch of mathematics concerned with the properties, relationships, and measurement of points, lines, curves, and surfaces
noun )
geometry
From geo = earth and metron = measure: measuring the land (earth

5. geometry- noun
branch of mathematics concerned with the properties, relationships, and measurement of points, lines, curves, and surfaces
From geo = earth and metron = measure: measuring the land (earth

6. Kilometer noun A unit of measure equal to 1,000 meters
from Gk. Khilioi = "thousand,"
A unit of measure equal to 1,000 meters

7. kilometer- noun -A unit of measure equal to 1,000 meters
from Gk. Khilioi = "thousand,"

8. From ‘baros’ = weight or pressure
barometer
noun
From ‘baros’ = weight or pressure
1. an instrument for measuring atmospheric pressure, usually to determine altitude or weather changes
2. anything that shows change or impending change: the barometer of social change

9. barometer- noun
1. an instrument for measuring atmospheric pressure, usually to determine altitude or weather changes
anything that shows change or impending change: the barometer of social change
From ‘baros’ = weight or pressure

10. Mystery Word- a wind gauge - an instrument for recording the speed and often the direction of winds
noun
anemometer
From ‘anemos’ = wind

11. anemometer- noun
a wind gauge - an instrument for recording the speed and often the direction of winds
From ‘anemos’ = wind

12. From ‘dia’ = through, across: literally means to measure across
diameter
noun
From ‘dia’ = through, across: literally means to measure across
1a. - a straight line connecting the centre of a geometric figure, esp a circle or sphere, with two points on the perimeter or surface
 b. the length of such a line

13. diameter- noun
1a. - a straight line connecting the center of a geometric figure, esp a circle or sphere, with two points on the perimeter or surface
 b. the length of such a line
From ‘dia’ = through, across: literally means to measure across

14. From ‘sym’ = same or equal: literally means to measure the same
symmetry
noun
From ‘sym’ = same or equal: literally means to measure the same
an exact correspondence in position or form about a given point, line, or plane
This is the mathematical definition. There are other definitions related to art, poetry, design, music etc. but generally the idea of harmony or equal measure applies to other definitions.
Rotational symmetry
Line symmetry

15. symmetry- noun- being balanced or well proportioned; an exact correspondence in position or form about a given point, line, or plane
symmetrical (adjective form)
This is the mathematical definition. There are other definitions related to art, poetry, design, music etc. but generally the idea of harmony or equal measure applies to other definitions.
From ‘sym’ = same or equal: literally means to measure the same