[se.date] adj [L sedatus, fr. pp. of sedare to calm; akin to sedere to sit--more at sit] (1663): keeping a quiet steady attitude or pace: unruffled syn see serious -- se.date.ly adv -- se.date.ness n
[2]sedate vt se.dat.ed ; se.dat.ing [back-formation fr. sedative] (1945): to dose with sedatives