Not compulsory; left to personal choice; elective.

Something that is not compulsory, especially part of an academic course.

(finance, business) The value of additional optional investment opportunities available only after having made an initial investment. / Quality or state in which choice or discretion is allowed.

In an optional manner. Not mandatorily.

present participle of optionalize

simple past tense and past participle of optionalize

To make optional; to add as an option, permit to be optionally omitted, or provide various options for implementing.

Third-person singular simple present indicative form of optionalize

plural of optional

plural of optionality