olemus
mittekohustuslik olem

Merriam-Webster:
3b: an item that is offered in addition to or in place of standard equipment
A sunroof is one of the options that you can get with the car.

näiteid
- käsu mittekohustuslik parameeter (optional command parameter)
- lisamälukaart (additional memory card)

vt ka
- optsioon
- valikuvariant