Final answer:
A polyglot is someone who speaks multiple languages, and this term is used to describe many Europeans due to the ease of movement and the closeness of different language-speaking countries within the EU.
Step-by-step explanation:
The term polyglot in the sentence 'Most Europeans are polyglots because they can go to European Union countries easily' refers to a person who speaks multiple languages. This reflects the linguistic diversity and multilingual abilities commonly found in Europe where movement between countries is relatively easy, especially within the context of the European Union. This ease of travel and the proximity of different nations fosters an environment where learning multiple languages is highly beneficial and often a necessity for communication and cultural exchange.