_Argumentum ad fidem._—An appeal to faith. _Argumentum ad hominem._—An argument to the person. _Argumentum ad ignorantiam._—An argument founded on an adversary’s ignorance of facts. _Argumentum ad judicium._—An appeal to the common sense of mankind. _Argumentum ad populum._—An appeal to the people. _Argumentum ad verecundiam._—An argument to modesty. _Argumentum baculinum._—Club law. _Arioso._—Light, airy. _Armiger._—One bearing arms; an esquire. _Arpeggio._—The notes of a chord played in rapid succession, and not simultaneously. (_Music._) _Arrière-pensée._—Mental reservation. _Ars est celare artem._—True art is to conceal art. _Assumpsit._—It is assumed or taken for granted. _Astra castra, Numen lumen._—The stars my camp, the Deity my light. _At spes non fracta._—But hope is not broken. _Au fait._—Well instructed; master of it. _Au fond._—To the bottom, or main point. _Au pied de la lettre._—Literally. _Au pis aller._—At the worst. _Au revoir._—Farewell. _Audi alteram partem._—Hear the other side. _Aura popularis._—The gale of popular favour. _Auri sacra fames._—The accursed thirst for gold. _Auter droit._—Another’s right _Auter foit._—Another time. _Auter vie._—Another’s life. _Aut vincere aut mori._—Victory or death. _Auto-da-fé_, _Auto-de-fe_.—An act of faith; burning of heretics. _Auxilium ab alto._—Help from on high. _Avant-coureur._—A forerunner. _Ave, Maria._—Hail, Mary. _Badinage._—Light or playful discourse. _Bagatelle._—A trifle. _Bas bleu._—A blue-stocking; a literary woman. _Basso-continuo._—Thorough bass. _Basso-relievo._—Figures in low relief. _Bateau._—A long light boat. _Beau-idéal._—A model of ideal perfection. _Beau monde._—The fashionable world. _Bel esprit._—A brilliant mind. _Bella-donna._—The deadly nightshade; fair lady. _Belles-lettres._—Polite literature. _Bellum internecinum._—A war of extermination. _Bellum lethale._—A deadly war. _Bene placito._—At pleasure. (_Music._) _Benigno numine._—-By the favour of Providence. _Ben trovato._—Well found; an ingenious solution. _Billet-doux._—A love-letter. _Bis dat qui citò dat._—He gives twice who gives promptly. _Bis peccare in bello non licet._—To blunder twice is not allowed in war. _Bis vincit, qui se vincit in victoriâ._—He conquers a second time, who controls himself in victory. _Bizarre._—Odd; fantastic. _Blasé._—Surfeited. _Bon gré mal gré._—Willing or unwilling. _Bon jour._—Good-day; good-morning. _Bon mot._—A witty saying; a jest; a quibble. _Bon soir._—Good-evening. _Bon ton._—High fashion; first-class society. _Bon vivant._—A high liver. _Bona fide._—In good faith. _Bon-bon._—A sweetmeat; confectionery.