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“execute” in Latin

The English word execute itself goes back to Latin sequor, through exsecutus.

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

execute
exsequi: persequi (to follow up anything till it is done, especially of things done by rule or direction, officium, mandata): conficere (to bring to an end, so that the labor is over; to finish, without reference to the production of a perfect work: itinera, mandata, conficiuntur, non perficiuntur nec absolvuntur, D.): efficere: ad effectum adducere (to bring to actual existence): perficere (to carry through to the end; to make anything perfect; opposed to inchoare, to begin): absolvere (to finish off, so that no more remains to be done; to make complete; opposed to inchoare, instituere). (The words are found in this connection and order.) absolvere ac (et) perficere: peragere (to carry a business through): sometimes facere alone (opposed to cogitare). To be able to execute anything, *parem esse alicui rei exsequendae: to execute a commission, jussum or imperatum facere: mandata efficere, conficere, perficere, exsequi, persequi; in the exactest manner, mandata exhaurire: imperio alicujus defungi: to execute a will, testamentum facere (general term) or conficere.
Punish capitally, supplicium capitis sumere de aliquo: supplicio capitis afficere aliquem: aliquem supplicio punire: aliquem morte multare: to execute (if the mode is beheading), caput alicujus praecidere (with the sword; it would be wrong to say caput cervicibus abscidere; unless the person is first strangled, Cic., Phil., 2, 2, cervicibus fractis caput abscidit): securi ferire or percutere (with the axe, as the instrument used by the executioner): decollare (as a general term, post-Augustan; Sen. and Suet., and even then rejected from the more elevated style): to be tortured and then executed, omni supplicio excruciatum, or omnibus cruciatibus affectum necari.

Quick answer

What is the Latin word for execute?
The usual Latin words for “execute” are exsequor, persequor, cōnficiō; also efficiō, perficiō, absolvō. 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.