Os·ten'sive adjective Showing; exhibiting. Ostensive demonstration (Math.) , a direct or positive demonstration, as opposed to the apagogical or indirect method. Found on http://www.encyclo.co.uk/webster/O/38
(Lat. ostendere, to show) Property of a concept or predicate by virtue of which it refers to and is clarified by reference to its instances. -- A.C.B. Found on https://www.encyclo.co.uk/local/21203