In an optional manner. Not mandatorily.

One of a set of choices that can be made. / The freedom or right to choose.

To purchase an option on something. / (computing, dated) To configure, by setting an option.

Not compulsory; left to personal choice; elective.

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

plural of option

Third-person singular simple present indicative form of option

(finance) Of or pertaining to options on a stock or equity. For some stocks, it is possible to trade options on them, hence they are optionable, for other stocks options aren't traded so they are not optionable.

(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.

simple past tense and past participle of option