The process of making something optional.

(naturism) Allowing and encouraging nudity but tolerating the wearing of clothes, as between nudist and clothing compulsive. Abbreviation: C.O.

(finance) An option that can be exercised only at expiry date.

(finance) An option that can be exercised at specific dates between issue date and expiry date. Sometimes known as a mid-Atlantic option.

(finance) an option that can be exercised at any date between the issue date and the expiry date.

Alternative spelling of cooption

(graphical user interface) A radio button.

plural of European option

plural of American option

plural of Bermudan option