When you are using any suffix, remember it gets added to the end of a base word. The suffix ‘-ment’ means the act of doing something or the result of an action. When you add ‘-ment’ to the end of a base word, you create a brand new word!

Is meant correct?

Mean is simple present tense. Meant is simple past tense. In that sentence, meant would be correct because could is simple past tense.

Is there such a word as ment?

Ment is defined as a result, condition, process or is defined as of doing something. An example of ment is movement, which is the changing of position. An example of ment is payment, which is what is paid by a person.