1. Dominant language: This refers to the language spoken by the majority of people in a particular region or country. For example, English is the dominant language in the United States, Spanish in Mexico, and Arabic in Egypt.
2. Primary language: This refers to the language a person learned first and is most fluent in. It's often the language spoken at home during childhood.
3. Official language: This refers to the language that is officially recognized by a government for use in official functions like government documents, education, and legal proceedings. A country can have one or more official languages.
4. Main language in a specific context: Sometimes, "main language" is used to refer to the primary language used in a specific setting, like a workplace or school.
To understand what "main language" means in a specific context, you need more information. For instance, if you're asked about the "main language" of a website, they're likely asking about the language the website is primarily designed in.
If you can provide more context about where you encountered this term, I can give you a more precise answer.