1. The dominant language in a specific region or country: This is the language spoken by the majority of the population and used in official communication, education, and media. For example, the main language of the United States is English.
2. The primary language someone uses in daily life: This is the language they are most comfortable speaking and understanding, even if they are multilingual.
3. The language that is the foundation of a person's identity: This is the language they associate with their family, culture, and heritage.
4. The language that is most important for a specific purpose: For example, the main language for a business might be English, even if the employees speak different languages at home.
5. The language that is most commonly used in a particular field or industry: This might be English for science, French for fashion, or Spanish for tourism.
Without further context, it is difficult to determine the specific meaning of "main language". To understand the meaning, you need to consider the situation or the person using the term.
If you could provide more information about what you're looking for, I can give you a more specific answer.