American Heritage Dictionary
Century Dictionary
(3)
GNU Webster's 1913
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WordNet
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Elsewhere on the web
Is ratiocination, then, not a process of inference?— Blackwood's Edinburgh Magazine, No. CCCXXXVI. October, 1843. Vol. LIV.
Arthur Symons, in his `Introduction to the Study of Browning', remarks it is as a piece of ratiocination--suffused, indeed, with imagination-- that the poem seems to have its raison d'etre.— An Introduction to the Study of Robert Browning's Poetry
Where were Mr Atherstone's powers of ratiocination, and all his acoustics?— Recreations of Christopher North, Volume 2

Century Dictionary (1)
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