The state of being tranquil; peacefulness, the absence of disturbance or stress; serenity; calm.

A census-designated place in Fresno County, California, United States. / Ellipsis of Sea of Tranquillity.

The act of calming a person or animal, or putting them to sleep, using a drug. / The act of making someone or something tranquil.

Of a drug: having the effect of calming a person or animal, or putting them to sleep; sedating, sedative. / (literary) Having the effect of making someone or something tranquil; calming, soothing.

present participle of tranquilize

(transitive) To calm (a person or animal) or put them to sleep using a drug. / (transitive, now literary) To make (something or someone) tranquil. / (intransitive, obsolete, rare) To become tranquil.

(US) Alternative spelling of tranquilizer

plural of tranquilizer

That which tranquillizes or soothes. / (pharmacology) A drug used to reduce anxiety or tension.

Free from emotional or mental disturbance. / Calm; without motion or sound.