Acadiensis is a fancy word used to talk about the history, culture and people of a group of French settlers who lived in Canada a long time ago. They were called Acadians.
Now, a long time ago, there was a country called France. Some of the people from France went to Canada to start a new life. They really liked it there and they called themselves Acadians. They loved their new home so much that they grew their own food, sang their own songs and spoke their own version of the French language.
But then, something really sad happened. Another group of people who were from England took over the land, and they didn't like the Acadians or their way of life. They asked the Acadians to leave their homes and go somewhere else.
The Acadians didn't want to leave their homes and many of them stayed. But the English people were very mean to them and made it very hard for them to stay. They took their land, their animals and even separated the families. This made the Acadians very sad and they had to leave their homes eventually. This event is called The Great Expulsion.
Even though the Acadians had to leave their homes, they didn't forget about their culture and traditions. They passed down their stories and songs from generation to generation. People who study history and culture still talk about the Acadians to this day, and they write articles and books about them. So, Acadiensis is really just a big word that means we like to learn and talk about the Acadians and their culture.