  In the preface to the translation of the Guide, Ibn Tibbon explains that, in his translation of Maimonides, he had consulted previous translations, rendered by his father and by others. Moreover, he explains that, when a term already exists, he will follow established convention, even when he disagrees. One example of this ambivalent deference to tradition is his definition of “logic” in the glossary. The text (from Perush ha-Millot ha-Zarot, ed. Even-Shemuel, pp. 43-4; corrected by Hebrew MS London 904, 164b) reads as follows: