Definition of "regimen"

Seven or eight annual bloodings, and as many purgations — such was the common regimen the theory prescribed to ensure continuance of health […]

1832, The Edinburgh Review, page 470

...and, having an excellent constitution, regularly attributed any temporary ailment of her daughters to carelessness, for which she prescribed "water gruel, and keeping in bed," being certain that under so safe a regimen, "they would get well as soon as possible, and learn to keep well also."

1842, [anonymous collaborator of Letitia Elizabeth Landon], chapter XLII, in Lady Anne Granard; or, Keeping up Appearances. […], volume II, London: Henry Colburn, […], page 229

(3.) Verbs admit two kinds of regimen: the direct regimen and the indirect regimen. (4.) The direct regimen, or immediate object [...] (5.) The indirect regimen, or remote object [....]

The Popular Educator. A Complete Encyclopaedia of Elementary, Advanced, and Technical Education. New and Revised Edition. Volume III., page 394 (Lessions in French.---LVIII. § 42.---Of Verbs)

Active verbs express an action which an agent, called the nominative or subject, performs on an object or regimen, without the help of a preposition: as,--- Pierre aime Sophie, Peter loves Sophia. [...] Of the Object or Regimen of Verbs.

1828, J. V. Douville, The Speaking French Grammar, forming a series of sixty explanatory lessons, with colloquial essays, 3rd edition, London, page 84 & 315

15. A verb is active in French when it expresses that an agent called nominative, or subject, performs an action on an object, or regimen, without the help of a preposition---as, Jean frappe Joseph, John strikes Joseph, &c.

1831, A. Bolmar, “A Book of the French Verbs, Wherein the Model Verbs, and Several of the Most Difficult Are Conjugated Affirmatively, Negatively, Interrogatively, an Negatively and Interrogatively.”, in A Book of the French Verbs, Wherein the Model Verbs, and Several of the Most Difficult Are Conjugated Affirmatively, Negatively, Interrogatively, an Negatively and Interrogatively. A New Edition, Philadelphia, published 1854, page 2

Pronouns may be nominatives, and of the direct or indirect regimen.

1847, M. Josse, A Grammar of the Spanish Language with Practical Exercises. First Part, page 51