gratis  
[gra·tis || ‘greɪtɪs ,’grætɪs]
adv. free, at no charge, without cost
adj. costing nothing, free of charge

free  
[frɪː]
v. release, liberate; exempt; remove something which restricts or confines; loosen, disentangle, clear away
adj. liberated; released; possessing liberty; available; exempt; given at no charge; plentiful; unrestrained
adv. at no charge; freely, in a free manner