A proposed “ticket”; a programme of nominees.

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1877.  The facts about the latest Cabinet slate … are interesting as showing what is thought … as to the course of President Hayes in choosing his advisers.—N.Y. Tribune, March 1 (Bartlett).

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1893.  Taking it for granted that, sooner or later, wholesale changes will be made, “slates” have been arranged in which all conflicting “claims” have been nicely adjusted.—The Nation, N.Y., March 2, lvi. 158/3.

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