LATIN DICTIONARYLexicon Latīnum
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“maintain” in Latin

The English word maintain itself goes back to Latin teneō, through manuteneo.

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

maintain
To support, defend, tenere, obtinere (where the truth is contested): contendere; defendere (the former, to endeavor to carry against a different opinion; the latter, to defend; both, against opposition): affirmare (to maintain as true, to assert, affirm): asseverare (to maintain earnestly: ☞ in Cic., followed by an accusative and infinitive; in the Silver Age, found also, with a simple accusative. ☞ Asserere is not classical in this sense): efficere (to establish by proof): disserere, disputare (to assert and discuss): ponere, proponere, placet or videtur mihi (to lay down as one’s own opinion): dicere (to give as one’s opinion: all followed by an accusative and infinitive): aio (I say that a thing is so; opposed to nego): to maintain the contrary, negare: Democritus maintains that no one can be a good poet without enthusiasm, Democritus negat, sine furore quemquam poetam magnura esse posse.
To supply with the necessaries of life, nutrire aliquem (to nourish with food and drink): alere (in a wider sense, to furnish everything that serves for sustenance): sustinere, sustentare aliquem, victum alicui praebere (to care for one’s maintenance): to maintain one’s self by any means, alere se aliqua re (e.g., se suosque latrociniis): victum quaeritare aliqua re (e.g., lanā ac telā, Terentianus, Andr., 1, 1, 48; therefore, by one’s needle, acu): to maintain one’s self by selling chaplets, coronas venditando sustentare paupertatem: maintain one’s self by the labor of one’s hands, manum mercede tolerare inopiam.

Quick answer

What is the Latin word for maintain?
The usual Latin words for “maintain” are teneō, obtineō, contendō; also dēfendō, affirmō, assevērō. 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.