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“expel” in Latin

The English word expel itself goes back to Latin pellō, through expellere.

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

expel
expellere (from a place; ex, de, a loco, or loco only; e.g., aliquem ex urbe, ex republica; plebem ex agris; aliquem a patria; aliquem domo sua, all Cic.; aliquos agris, finibus, possessionibus, all Caes.; me civitate, Cic.; aliquem patria, Liv.): exigere (e.g., aliquem ex civitate; hostem campo or e campo, Liv.; aliquem domo, Liv.). ☞ Afrer expellere, exigere, the place from which must be expressed with ex etc., unless it is evident from the context: ejicere (to cast out, aliquem e senatu, Cic.; de senatu, Liv.; ex oppido, Caes.; de collegio, Cic.; a suis diis penatibus, Cic.; aliquem finibus, Sall.; domo, Caes.; aliquem, Cic.): exturbare (aliqua re or ex aliqua re; to drive out headlong or in confusion, aliquos e possessionibus, ex agris, e civitate; hostem [ex] ruinis muri; also aliquem focis patriis disque penatibus praecipitem exturbare, Cic.): exterminare (to drive beyond some boundaries; very seldom, except in Cic.; aliquem ex urbe, ex hominum communitate; de civitate; a suis diis penatibus [with expellere a patria], aliquem urbe atque agro; also, aliquem absolutely; all Cic.). (The words are found in this connection and order.) expellere atque ejicere; exturbare et expellere; expellere atque exturbare (☞ Cic. uses together ex urbe expellere, exterminare, projicere): depellere (aliquem aliqua re or de aliqua re; e.g., urbe, ex urbe, de provincial): dejicere (to drive anybody from a place he occupies or possesses, de possessione alicujus rei, de fundo; especially as military technical term dejicere hostes ex castello, ex saltu, etc.; also muro, turribus, loco).
FIG., To expel hunger, famem sitimque cibo et potion e depellere; weariness, lassitudinem ex corpore depellere; cares, curas pellere; empty cares, inanes curas pellere, dispellere or fugare; sadness, tristitiam ex animo pellere: to expel devils, daemonas adjuratione divini nominis expellere ac fugare (Lactantius).

Quick answer

What is the Latin word for expel?
The usual Latin words for “expel” are expellō, exigō, exturbō; also exterminō, dēpellō. 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.