Definiciones
1.VerbTo calm (a person or animal) or put them to sleep using a tranquilizer dart."The escaped lion was finally tracked down, tranquilized, and safely returned to the zoo."
2.VerbTo make (something or someone) tranquil.
3.VerbTo become tranquil.
4.VerbTo dart (a person or animal) with a sedative"The bear should go down several minutes after being tranquilized."
5.Verb↑ Thomas Blount, Glossographia, London: George Sawbridge, 1661: “Tranquillize […] to make quiet, still or calm, to cause tranquility.”