Here are some possibilities and their meanings:
* "mas" as part of a longer word: Some words may contain "mas" as part of a larger suffix. For example, "ismas" is a suffix used in some Latin words. However, it's not a standalone suffix in English.
* "mas" in other languages: The word "mas" might be a suffix in another language. Could you tell me what language you're thinking of?
* "mas" as a misspelling: Perhaps you're thinking of a different word that has a similar spelling but a different meaning.
Please provide more context or information so I can help you understand the meaning of "mas."