petitio principii UK /pɪˈtɪʃiˌəʊ prɪnˈkɪpiˌaɪ/US /pəˈtɪʃiˌoʊ prɪnˈsɪpiˌaɪ/ noun2 •The logical fallacy of begging the question (i.e., "assuming the conclusion"). •A particular argument which commits the fallacy of begging the question; a circular argument.A somewhat similar objection has been made by Locke and others, to the effect that the ordinary demonstrative syllogism is a petitio principii. — 1869
