(graphical user interface) A radio button.

Alternative spelling of cooption

plural of co-option

(US, politics, historical) A 1980s plan whereby all Soviet and American nuclear weapons would be mutually withdrawn from Europe.

(business, often attributive) A business practice in which a customer agrees to have goods or services provided automatically, and must either continue to pay for the service or specifically decline before being rebilled.

(finance) A put option that makes a payoff in the event the issuer of a specified reference asset defaults.

plural of optionally piloted vehicle

plural of credit default option

(US, military, aviation) An aircraft that may be manned or unmanned, able to function in either mode without modification.

(idiomatic) To not commit to a decision, to keep various options available.