ruler
//ˈruːlər//
Noun
rulerSingular
rulersPlural
1
A person who rules or governs a country, state, or people; a sovereign or leader.
The ruler of the country made an important decision.
Noun
rulerSingular
rulersPlural
1
A straight strip of rigid material, typically marked with units of measurement, used for measuring lengths or drawing straight lines.
I used a ruler to draw a straight line.