LATIN DICTIONARYLexicon Latīnum
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“devotion” in Latin

The English word devotion itself goes back to Latin voveō, through dēvōtiō.

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

devotion
Act of devoting, devotio (act of sacrificing one’s self for one’s country, etc.; also solemn form of curse, bann, etc.): dedicatio (act of consecrating. ☞ Not dicatio = [from context] “the act, dicandi se in aliam civitatem;” sacratio, late; Macrobius): sepositio (act of setting apart, late; Ulp.).
State of being devoted to; devoted attachment to, studium (zeal, predilection for an object = “animi assidua et vehemens ad aliquam rem applicata magna cum voluptate occupatio, ut philosophiae,” etc., Cic., Invent., 1, 25, 36): to anything, alicujus rei; also with gerund in di; discendi, etc.: obsequium (compliance; obsequiousness to the will of any one): observantia (devotedness accompanied with esteem): voluntas: benevolentia (good will): fidus in aliquem animus (fidelity): pietas (dutiful affection): singularis in aliquem fides atque animus (devoted fidelity and attachment; Cic.): incredibilis quidam amor (to a person): omnia in aliquem summa ac singularia studia (Cic.): to prove one’s devotion to anyone, *probare alicui voluntatem suam: he assured him of his entire devotion, se proprium ejus fore confirmavit: he perceived his particular devotion to himself, egregiam in se voluntatem perspexit: the devotion of the legions, prompta studia legionum.
Devoutness, attenta rerum divinarum cogitatio, contemplatio (a directing of the mind to a religious object): pietas erga Deum: sanctitas. (The words are found in this connection and order.) pietas et sanctitas: with devotion, pie (with the fear of God): without devotion, negligenter, frigide: to fill the hearers with devotion, audientium animos religione perfundere.
Devotions, preces: meditationes piae: meditationes pietatis augendae or alendae causa, institutae: to disturb anyone’s devotions, pias alicujus meditationes turbare, interpellare. Vid: PRAYERS.

Quick answer

What is the Latin word for devotion?
The usual Latin words for “devotion” are dēvōtiō, dēdicātiō, sēpŏsĭtĭo; also studium, contemplātiō, sānctitās. 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.