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Use "excogitation" in a sentence
"Right or wrong, Rumour was very busy; and Lord Decimus, while he was, or was supposed to be, in stately excogitation of the difficulty, lent her some countenance by taking, on several public occasions, one of those elephantine trots of his through a jungle of overgrown sentences, waving"
"Nobody can come to the knowledge of an event by his own reflection, by excogitation."
"And it was admittedly not an excogitation of the Brahmanical mind itself."