[su.per.sede] vt -sed.ed ; -sed.ing [ME superceden, fr. MF superseder to refrain from, fr. L supersedere to be superior to, refrain from, fr. super- + sedere to sit--more at sit] (15c) 1 a: to cause to be set aside b: to force out of use as inferior
2: to take the place, room, or position of
3: to displace in favor of another: supplant syn see replace -- su.per.sed.er n