obtestation
/ˌɒbtɛsˈteɪʃn/Now rare
noun
The action of calling God (heaven, etc.) to witness; protestation; an instance of this; an oath.
Origin
Mid 16th century (in an earlier sense). From Middle French, French †obtestation or its etymon classical Latin obtestātiōn-, obtestātiō the action of calling upon, solemn invocation, the action of beseeching or imploring, earnest entreaty from obtestāt-, past participial stem of obtestārī + -iō.
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