What is being a free mason?

Answer 1

A free mason is a member of the Freemasonry. It is a fraternal organisation that arose from obscure origins in the late 16th to early 17th century. Freemasonry now exists in various forms all over the world, with a membership estimated at around 5 million (including around 480,000 in England, Scotland and Ireland alone, and just under two million in the United States). The various forms all share moral and metaphysical ideals, which include, in most cases, a constitutional declaration of belief in a Supreme Being.

For more information http://en.wikipedia.org/wiki/Free_mason