(military) An order that weapons may be fired at targets (especially aircraft or missiles) that are not positively identified as friendly.

(software) Software that can be freely copied, redistributed and modified, including source code; software that is libre. / (software) Any software that is free of charge, such as freeware.

Made or distributed without the ability to enforce regional lockout.

plural of free throw

plural of free ball

(statistics) Free of specific assumptions about the shape of the probability distribution generating the sample.

plural of free kick

plural of free variable

Without any (especially harmful) microorganisms; aseptic. / (sciences) Specifically, pertaining to an animal with no microorganisms living in or on it, used in gnotobiotic research.

(idiomatic) An opportunity or benefit which has no cost, especially one enjoyed or undertaken at the expense of others.