American Heritage Dictionary
Century Dictionary
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GNU Webster's 1913
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WordNet
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Elsewhere on the web
Lord Falkland, Charles's Secretary of State, "sitting among his friends, often, after a deep silence and frequent sighs, would, with a shriek and sad accent, ingeminate the words, Peace!— The Atlantic Monthly, Volume 03, No. 20, June, 1859
‘With curling nose ingeminate the peals.’”— Early English Meals and Manners
"The Stratfordian," says Mr. Greenwood, "will ingeminate 'Genius!— Shakespeare, Bacon, and the Great Unknown
'Yes,' I hear you ingeminate; 'but what about Examinations?— On The Art of Reading
In his clothes and habit, which he had minded before always with more neatness, and industry, and expense, than is usual to so great a soul, he was not now only incurious, but too negligent; and in his reception of suitors, and the necessary or casual addresses to his place, so quick, and sharp, and severe, that there wanted not some men--strangers to his nature and disposition--who believed him proud and imperious; from which no mortal man was ever more free When there was any overture or hope of peace, he would be more erect and vigorous, and exceedingly solicitous to press anything which he thought might promote it; and sitting among his friends, often, after a deep silence, and frequent sighs, would, with a shrill and sad accent, ingeminate the word Peace, Peace_; and would passionately profess, "that the very agony of the war, and the view of the calamities and desolation the kingdom did and must endure, took his sleep from him, and would shortly break his heart."— The Ontario Readers: The High School Reader, 1886

Century Dictionary (2)
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