Definition of ratiocinate in English:



[NO OBJECT]formal
  • Form judgements by a process of logic; reason.

    ‘a tendency to ratiocinate in isolation’
    • ‘Almost definitely two, actually, since she knew there were three new arrivals, and of course, she had already met one, she ratiocinated.’
    • ‘His father, Alan Fry, was written up as the villain in these early times; an inventor whose ‘infuriatingly, cold, precise ratiocinating engine of a brain fuelled by a wholly egocentric passion.’’
    • ‘If the candidate seems prepared to ratiocinate every policy question rather than apply values to its solution, that candidate will lose.’
    • ‘Man is said, for instance, to be the ‘rational animal,’ but you won't find much ratiocinating among fetuses.’


Mid 17th century: from Latin ratiocinat- deliberated, calculated, from the verb ratiocinari, from ratio (see ratio).