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“opening” in Latin

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

opening s.
Act of opening, apertio (patefactio, only figuratively, act of divulging); or by the verbs.
Aperture, foramen (general term for any opening made by boring): cavum (burrow, pit, etc.): hiatus (any yawning fissure): rima (fissure; a cut made lengthwise): lissura (a rent): lacuna (a space not filled up; e.g., in a ceiling): lumen (the opening of a window or door; any opening through which light can penetrate): fenestra (aperture of a window): os (mouth-like aperture; e.g., of a cave): apertura (Vitr.): [If it is = AIR-HOLE, Vid:] To make an opening in anything, aliquid aperire (general term): perforare (to bore through it): to have openings, aperturas habere (Vitr.):
Commencement, initium: exordium: to make an opening, viam sibi munire (ad aliquid): the opening of a speech, prima orationis verba; exordium, prooemium (☞ never initium): an opening-speech, oratio sollemnis qua initium alicujus rei auspicatur aliquis (after Suet., Cal., 54): [Vid: BEGINNING.]
An initial festival (e.g., the opening of a road, theatre, etc.), *dies festus, quo initium alicujus rei auspicatur aliquis (after Suet., Cal., 54).
opening
participle adjective, (i. e., purgative), catharticus: alvum solvens or movens: opening medicine, medicamentum catharticum: medicina alvum solvens or movens (Cels.): to give opening medicine, dejectionem alvi ductione moliri, purgatione alvum sollicitare (to administer a purgative): to give opening medicine, cathartica dare (general term): one must take some opening medicine, dejectio a medicamento petenda est: to take opening medicine, alvum dejicere (of the effect); perhaps *alvum medicamento cathartico solvere or movere.

Quick answer

What is the Latin word for opening?
The usual Latin words for “opening” are apertiō, forāmen, cavus; also hiātus, rīma, lacūna. 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.