The word belgicism (known in French and Dutch as a belgicisme) refers to a word, expression, or turn of phrase that is uniquely Belgian French, or Belgian Dutch. Even though the French spoken in Belgium is closer to the French spoken in France than the French spoken by Québécois, there are a considerable number of words and phrases that have disappeared from common usage in other Francophone nations that remain common in everyday Belgian speech.
Certain words used in Belgium that are not used in Standard French are also found in Northern France and in Switzerland, for example chicon (endive) and septante (seventy, unlike the ventigesimal soixante-dix, or sixty-ten, used in France.) In these cases, these words are sometimes not classified as being solely belgicisms.
Read more about Belgicism: Origins of Belgicisms, Different Types of Belgicisms, Some Examples, Dutch Belgicisms