Free

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The transitive verb to free may variously mean to emancipate, to release from a constriction, or to confer freedom.

The adjective free appears in many contexts:

Economics

Mathematics

Philosophy

Negative - there is no such thing as a free lunch, freedom is not free

Positive - free as a bird or free oxygen

Literature

Free, a pseudonym for the activist and writer Abbie Hoffman

Computer science

free is a function in C programming language which deallocates or unloads a certain part of the memory.

Freebie Websites

There are many examples of websites that offer free things, often for doing surveys etc.