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“ought” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

ought v.
debeo: oportet (oportet denoting the moral duty; debeo the individual’s obligation to perform it): participle in dus. Sometimes decet (it is becoming), aequum est (it is fair). ☞ “I ought to do it” is facere debeo or me facere oportet: I ought to have done it, facere debebam or debui; or me facere oportebat or oportuit: and ☞ that the indicative is used, even when a conditional sentence is added with verb in imperfect or pluperfect subjunctive; e.g., omnibus cum contumeliis onerasti, quem patris loco, si ulla in te pietas esset, colere debebas (Sall., Jug., 85): so if participle in dus is used; e.g., quodsi Gnaeus Pompeius privatus esset, hoc tempore tamen erat mittendus (Zumpt, 519).
ought
= Any thing, aliquid; res quaepiam; quidpiam.

Quick answer

What is the Latin word for ought?
The usual Latin words for “ought” are dēbeō, oportet, decet; also quispiam. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.