Word of the Day.

demonstration   

Function: noun

Plural: demonstrations

Meanings:
1 : an act of showing someone how something is used or done
Examples:
[count] <I went to a sculpture demonstration last weekend.>
<One of the instructors gave/did a demonstration of how to prune a tree.>
<Would you mind giving us a demonstration so that we can see how the machine works?>
[noncount] <He brought along a copy of the software for demonstration.>

Note: This sense of demonstration is sometimes used before another noun.
Example:
<We saw a demonstration [=demo] version of the new software.>

2 : an event in which people gather together in order to show that they support or oppose something or someone
Examples:
[count] <Students took part in several nonviolent/peaceful demonstrations against the government.>
<demonstrations against the war = antiwar demonstrations>
<demonstrations for women’s rights>
[noncount] <Protesters marched in demonstration.>

3 : an act of showing or proving something
Example:
[count] <The latest tests are a clear demonstration that the vaccine works.>

Note: This sense of demonstration is often followed by of.
Examples:
<a demonstration of their power/loyalty/skill>
<a demonstration of grief/bravery>
<They brought some bread to share as a demonstration [=token] of goodwill.>
[noncount] <Many people sent cards and flowers in demonstration of their sympathy.>

Derived form:
demonstrational adjective
Example:
<a demonstrational video>