Optional Argument's Value Could Not Be Transferred For The `*matrix` Environment In L3doc

The meaning of optional is involving an option : How to use optional in a sentence. If something is optional, you can choose if you want to do it, pay it, buy it, etc.:

See examples of optional used in a sentence. Optional synonyms, optional pronunciation, optional translation, english dictionary definition of optional. Definition of optional adjective in oxford advanced learner's dictionary.

To acquire or grant an option on: The studio has optioned his latest novel for film adaptation. Optional in american english (ˈɑpʃənəl ) adjective left to one's option, or choice;