To render tranquil; to allay when agitated; to compose; to make calm and peaceful; as, to tranquilize a state disturbed by factions or civil commotions; to tranquilize the mind.
- To make tranquil; pacify: "Nothing contributes so much to tranquilize the mind as a steady purpose” ( Mary Shelley).
- To sedate or relieve of anxiety or tension by the administration of a drug.
- To become tranquil; relax.
- To have a calming or soothing effect.