LATIN DICTIONARYLexicon Latīnum
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“open” in Latin

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

open adj.
PROPR., apertus, adapertus (opposed to clausus, involutus): patens (lying or standing open): patefactus (thrown open): propatulus (accessible on all sides): (The words are found in this connection and order.) patens et apertus; apertus et propatulus: purus (not covered with trees or other things): expeditus (unobstructed): facilis (easy): an open plain, campus apertus (Caes.); patens (Liv.): the open sea (high sea), mare apertum (not shut in by the land; opposed to mare conclusum, Caes.); also altum (the high seas, Cic.): *mare glacie solutum (freefrom ice): (of the body), laxus, solutus (opposed to astrictus; suppressus): to keep the body open, alvum mollire, elicere: an open door, fores apertae (Terentianus); adapertae (Liv.); patentes (wide open, Cic.): an open, letter, epistola non obsignata (unsealed): aperta or resignata (that has been opened or unsealed): epistola soluta or vinculis laxatis (with reference to the Roman custom of tying a thread round it): open eyes, oculi patentes: to stand with the mouth open, ore hiante adstare: to receive one with open arms, libens ac supinis manibus aliquem excipere (Suet., Vitell., 7); libenti laetoque animo excipere aliquem (after Cic.); suo complexu sinuque recipere (figuratively, Cic.); to keep open table, alicui quotidie sic cena coquitur, ut invocatis amicis una cenare liceat (after Nep., Cim., 4, 3). To be open, apertum esse, patere (also IMPROP., as,” his ears are open to all complaints,” patent aures ejus querelis omnium):
Figuratively, candid, ingenuous, apertus: ingenuus: simplex.
Not yet decided, nondum dijudicatus: to be an open question, adhuc sub judice lis est (Hor.); adhuc de hac re apud judicem lis est (the former IMPROP., the latter PROP., of a judicial question, Asc., Cic., Verr., 1, 45): to be left open, integrum relinqui or esse.
open v.
TRANS., PROPR., aperire, adaperire (to remove whatever covers or conceals; opposed to operire, adoperire): patefacere (to throw open, cause to stand open); ☞ recludere and reserare arealmost entirely confined to the poets: to open the eyes, oculos aperire, tollere, allevare: not to venture even to open one’s mouth, ne hiscere quidem audere: to open one’s purse, thecam numariam retegere: to open a cask, dolium relinere: to open a book, librum evolvere; volumen revolvere or explicare (☞ not adire librum for evolvere; adire libros sibyllinos means to go to consult the sibylline books): to open a door, ostium or fores aperire, adaperire, recludere or reserare (to unbolt, unbar): to open a window, fenestram patefacere: to open a letter, epistolam solvere; epistolae vincula laxare (Nep., Paus., 4, 1): Figuratively,
To make a beginning, initium alicujus rei facere; aliquid exordiri (to make an introduction): auspicari aliquid (to begin with a good omen; post-Augustan): to open a ball, *primam choream ducere: to open a sitting, *solemni more concioni praefari: to open a play with a prologue, *fabulam prologo auspicari (☞ Suet., Cal., 54).
To make known, reveal, discover, aperire; demonstrare; significare (to point out, call attention to anything): expromere, in medium proferre (to publish): proponere (to propose; e.g., bills, conditions): enunciare (to reveal a secret): to open a thing to anyone, communicare aliquid cum aliquo (general term, to communicate, impart): aliquem certiorem facere de re (to inform of anything): he opened his plan to me, denudavit mihi consilium suum (Liv., 44, 38, init.): to open one’s heart, secreta pectoris aperire (Tac., Germ., 22, 7); detegere alicui intimos suos affectus (Sen., Ep., 96, 1).
open v.
INTRANS., patescere, subito se aperire (of a door, the latter especially when it suddenly opens of its own accord): se aperire, se pandere, florem expandere (of flowers): hiscere, dehiscere (to form chinks, of the ground): discedere (of the heavens, etc.): florem aperire, dehiscere (of flowers): dissui (of a seam): laxari (to become loose, as a knot): solvi, exsolvi (to come apart, as a bandage, a cord): rumpi (of a swelling): recrudescere (of a wound).

Quick answer

What is the Latin word for open?
The usual Latin words for “open” are aperiō, adaperiō, pateō; also patefaciō, prōpatulus, pūrus. 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.