c. 1300, rebouten, "to thrust back," from Old French reboter, rebuter "to thrust back," from re- "back" (see re-) + boter "to strike, push," from a Germanic source (from Proto-Germanic buttan, from PIE root *bhau- "to strike").
Also in Middle English "assail (someone) with violent language, rebuke" (c. 1300); "repel in battle, repulse" (mid-14c.). The legalese sense of "try to disprove, refute by evidence or argument, bring counter-argument against" is attested by 1817. Related: Rebutted; rebutting.
suffix forming nouns of action from verbs, mostly from Latin and French, meaning "act of ______ing" (such as survival, referral), Middle English -aille, from French feminine singular -aille, from Latin -alia, neuter plural of adjective suffix -alis, also used in English as a noun suffix. Nativized in English and used with Germanic verbs (as in bestowal, betrothal).
<a href="https://www.etymonline.com/word/rebuttal">Etymology of rebuttal by etymonline</a>
Harper, D. (n.d.). Etymology of rebuttal. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/rebuttal