(chemistry, physics) A molecule, ion or atom that has one or more unpaired electrons, and which is generally highly reactive (and therefore often occurs only as a transient species).

a reed in a musical wind instrument whose edges do not overlap the edges of the opening over which it is fixed and that is used typically in the harmonium or concertina

(physics) vacuum; a space free of matter. / Used other than figuratively or idiomatically: see free, space.

(idiomatic, with to-infinitive) To feel able without giving offense. / (as imperative, with to-infinitive) You have my permission. / (as imperative, in response) You have my permission.

(American football, soccer, Australian rules football, rugby, other ballgames) a kick in which a player may kick the ball without interference from the opposition. Such a kick may be awarded for a foul by the opposition, or earned by a player such as by taking a mark.

(sports) A professional athlete who is free to play for or sign a contract to play for any team. / A person who acts freely, or without constraint to a higher power.

Alternative spelling of freethinker

(programming) A variable that is not bound to a storage location.

Of, related to or characteristic of a free market. Lacking wealth redistribution and government regulation.

International trade without government interference, especially from tariffs or duties on imports.