What is the Latin word for rely on?

The usual Latin words for “rely on” are fīdō, crēdō, tribuō; also adiungō. The right choice depends on the sense; see the distinctions below.

English → Latin

“rely on” in Latin

fīdōto trust, put confidence in; to rely upon crēdōto believe, to trust in, to give credence to; to confide in, have confidence in; to think, imagine, suppose, assume tribuōto grant, bestow, assign, attribute; to yield, give up, concede, allow; to divide, share, distribute adiungōto add, join, attach, append, annex or bind to (something); to apply to, direct to (mentally); to harness, yoke

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

rely on

fidere, or confidere alicui, or alicui rei, or aliqua re (to place one’s confidence in anybpdy or anything): fretum esse aliquo or aliqua re (to trust in, depend upon): niti aliqua re (to lean upon): fiduciam habere alicujus rei (to have confidence in anything): credere: fidem habere, or tribuere, or adjungere (to put faith in; all four without distinction; Vid: Cic., De Divin., 2, 55, 113: 2, 59, 122): not to rely upon anybody, alicui parum fidere; alicui fidem non habere; alicui parvam fidem habere; alicui diffidere: relying on, fretus aliqua re; nixus aliqua re (trusting in anything, leaning on it): ferox aliqua re (relying presumtuously; e.g., ex parte virium).

Quick answer

What is the Latin word for rely on?: The usual Latin words for “rely on” are fīdō, crēdō, tribuō; also adiungō. 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.