1) Allow 2) Countenance 3) Decriminalise 4) Decriminalize 5) Legalise 6) Legalize 7) Legitimate 8) Legitimatise 9) Legitimatize 10) Legitimise 11) Make legal 12) Permit 13) To make legitimate 1) Decriminalise 2) Decriminalize 3) Legalise 4) Legalize 5) Legitimatise 6) Legitimatize 7) Legitimise 8) Monetise 9) Monetize 10) Validate 
• (v. t.) To legitimate.
Le·git'i·mize (le*jĭt'ĭ*mīz) transitive verb [ imperfect & past participle Legitimized (-mīzd); present participle & verbal noun Legitimizing .] To legitimate.