Englishfor English speakers
demonstration
Noun
—
A demonstration of something is the act of showing that it is true or that it exists.
—
A demonstration of something is the act of showing how to do it or use it.
—
A demonstration is a gathering of people to protest something publicly.
polariscope
—
noun
(= polarimeter)
an optical device used to measure the rotation of the plane of vibration of polarized light