(1):
(superl.) Not intoxicated or excited by spirituous liquors; as, the sot may at times be sober.
(2):
(superl.) Temperate in the use of spirituous liquors; habitually temperate; as, a sober man.
(3):
(superl.) Not proceeding from, or attended with, passion; calm; as, sober judgment; a man in his sober senses.
(4):
(superl.) Serious or subdued in demeanor, habit, appearance, or color; solemn; grave; sedate.
(5):
(superl.) Not mad or insane; not wild, visionary, or heated with passion; exercising cool, dispassionate reason; self-controlled; self-possessed.
(6):
(v. t.) To make sober.
(7):
(v. i.) To become sober; - often with down.