From The Collaborative International Dictionary of English v.0.44 [gcide]:
4. An addition or amendment to a manuscript or other document, which is attached on a separate piece of paper; in legislative practice, an additional clause annexed to a bill while in course of passage; something extra or burdensome that is imposed.
From WordNet (r) 2.0 [wn]:
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
104 Moby Thesaurus words for "rider": addendum, affix, allonge, appendix, bidet, bill, broncobuster, buckaroo, caballero, calendar, carriage horse, cart horse, cavalier, cavalry horse, cavalryman, chevalier, circus rider, clause, coda, codicil, commentary, companion bills amendment, cowboy, cowgirl, cowpuncher, draft horse, dragnet clause, dray horse, driving horse, enacting clause, enclitic, envoi, epilogue, equestrian, equestrienne, escalator clause, fill horse, filler, gaucho, gigster, hack, hackney, hold-up bill, horse soldier, horseback rider, horsebacker, horseman, horsewoman, hunter, infix, interlineation, interpolation, jockey, joker, jument, knight, lead, leader, marginalia, motion, mount, mounted policeman, note, omnibus bill, pack horse, palfrey, plow horse, pole horse, polo pony, post-horse, postboy, postilion, postscript, prefix, privileged question, proclitic, proviso, puncher, question, remount, riding horse, road horse, roadster, roughrider, rouncy, saddle horse, saddler, saving clause, scholia, shaft horse, stalking-horse, steeplechaser, suffix, sumpter, sumpter horse, supplement, tail, thill horse, thiller, trick rider, vaquero, wheeler, wheelhorse, workhorse
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