‖a fortiori,advb.phr.|eɪfɔəʃɪˈɔəraɪ,fɔətɪ-|[L. a. from, fortiori stronger (sc.argumento).]With stronger reason, still more conclusively.1606R. ParsonsAnswer to Coke iii. 52Yet cannot hee either tacitè or à fortiore..take vnto him, all the power..which the said President and fellowes haue.1712ShaftesburyPlastics in Second Characters (1914) 158From hence argument a fortiori: How indecent is obscenity?1827Blackw.Mag.Feb. 207/2One might, a fortiori, count on his being murdered.1855H. SpencerPsychol.(1872) I. ii. i. 146The expression ‘substance of Mind’ can have no meaning..A fortiori, the substance of Mind cannot be known.1961New Scientist 16 Mar. 688/1Anyone who, being a mathematician or a scientist, loses his sight after leaving school—or, a fortiori, in mid-career—cannot easily escape feelings of deep dismay.