What does the Latin expression ‘et alia’ mean?

Certainly! The Latin expression 'et alia' means 'and others' in English. This phrase is often used in academic writing and research papers to refer to additional authors or sources that are being cited or referenced. When you see 'et al.' or 'et alia' in a list of authors or sources, it means that there are other people or works that are included in addition to the ones that have been specifically named. So, the correct answer for this question is 'and others'.