What is Free?

Legal Definition
Not bound to servitude; at liberty to act as one pleases. This word is put in opposition to slave.

2. Representatives and direct taxes shall be apportioned among the several states, which may be included within this Union, according to their respective numbers, which shall be determined by adding to the whole number of free persons, including those bound to service for a term of years, and excluding Indians not taxed, three-fifths of all other persons. Const. U. S. art. 1, s. 2. 3. It is also put in contradistinction to being bound as an apprentice; as, an apprentice becomes free on attaining the age of twenty-one years.

4. The Declaration of Independence asserts that all men are born free, and in at sense, the term includes all mankind.
-- Bouviers Law Dictionary
Legal Definition
Ships. By this is understood neutral vessels. Free ships are sometimes considered as making free goods.
-- Bouviers Law Dictionary
Legal Definition
1. Unconstrained; having power to follow the dictates of his own will. Not subject to the dominion of another. Not compelled to involuntary servitude. Used in this sense as opposed to "slave."

2. Not bound to service for a fixed term of years; in distinction to being bound as an apprentice.

3. Enjoying full civic rights.

4. Available to all citizens alike without charge; as a free school.

5. Available for public use without charge or toll; as a free bridge.

6. Not despotic; assuring liberty; defending individual rights against encroachment by any person or class; instituted by a free people; said of governments, institutions, etc. Webster.

7. Certain, and also consistent with an honorable degree in life; as free services, in the feudal law.

8. Confined to the person possessing, instead of being shared with others; as a free fishery.

9. Not engaged in a war as belligerent or ally; neutral; as in the maxim, "Free ships make free goods."
See also
-- Black's Law Dictionary
Legal Definition
Without restraint or coercion; not enslaved; not bound; exonerated; certain as applied to feudal services.
-- Ballentine's Law Dictionary