v. t. [ imp. & p. p. Superseded p. pr. & vb. n. Superseding. ] [ L. supersedere, supersessum, to sit above, be superior to, forbear, omit; super above + sedere to sit: cf. F. superséder. See Sit, and cf. Surcease. ] 1. To come, or be placed, in the room of; to replace. [ 1913 Webster ]

2. To displace, or set aside, and put another in place of; as, to supersede an officer. [ 1913 Webster ]

3. To make void, inefficacious, or useless, by superior power, or by coming in the place of; to set aside; to render unnecessary; to suspend; to stay. [ 1913 Webster ]

Nothing is supposed that can supersede the known laws of natural motion. Bentley. [ 1913 Webster ]

4. (Old Law) To omit; to forbear. [ 1913 Webster ]

‖n. [ L., suspend, set aside, stay, 2d pers. sing. present subjunctive of supersedere. See Supersede. ] (Law) A writ of command to suspend the powers of an officer in certain cases, or to stay proceedings under another writ. Blackstone. [ 1913 Webster ]