[[Fasciculus: Union City Oklahoma Tornado (mature).jpg|thumb|200px|Repentina tempestas, fortuitus casus]]
'''''ForceVis majeuremaior''''' ('vis maior'<ref>''[[Digesta Iustiniani]]'' 4.9.3.2.</ref>) vel '''fortuitus casus'''<ref>''Digesta Iustiniani'' 19.2.9.3; 19.2.11.1.</ref> est condicio sollemnis in [[pactum|pactis]] usitata, qua utraeque partes obnoxietate et [[obligatio]]ne exsolvuntur, cum aliquod eventum extraordinarium (sicut [[bellum]], [[operistitium|cessatio operae]], tumultus, [[scelus]], etc.) aut casus fortuitus (ut procella, [[inundatio]], [[terrae motus]], eruptio vulcani, etc.) prohibet, quominus una ambaeve partes obligationes suas ex pacto natas praestent. Re vera pleraeque condiciones ''force majeure'' defectionem alterius utrius partis non permittunt; immo, quoad "vis maior" fuerit, obligationem praestandam suspendet.<ref>{{cite web|url=http://www.amazon.com/International-Business-Environment-South-Western-Academic/dp/0538473614|title=Amazon.com: International Business Law and Its Environment, Eighth Edition (South-Western Legal Studies in Business Academic Series) (9780538473613): Richard Schaffer, Filiberto Agusti, Lucien J. Dhooge, Beverley Earle: Books|work=amazon.com}}.</ref><ref>[http://www.trans-lex.org/944000 Principle of Force Majeure (including international references)], Trans-Lex.org.</ref>
