FIDUCIAL Meaning of FIDUCIAL in English [ fɪ'dju:ʃ(ə)l ]■ adjective technical (of a point or line) assumed as a fixed basis of comparison.OriginC16: from late L. ~is , from fiducia 'trust'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004