• Webster's Revised Unabridged Dictionary
    • v. t Free-denizen To make free.
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Century Dictionary and Cyclopedia
    • free-denizen To make a free denizen or citizen of.
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In literature:

A beast is a grovelling denizen of the earth; a bird is a free citizen of the air.
"Concerning Animals and Other Matters" by E.H. Aitken, (AKA Edward Hamilton)
The free denizen of the boundless forest could no more live without liberty, than flame without air.
"The Knight of the Golden Melice" by John Turvill Adams
Free as woodland denizens, they chafed under military command.
"Pathfinders of the West" by A. C. Laut
Now, we hear many of our readers crying out against the barbarity of confining the free denizens of the air in wire or wicker Cages.
"Recreations of Christopher North, Volume 2" by John Wilson