monstrātĭo, ōnis, f. [monstro],
a showing, direction (only in Terence and Vitruv.): defessus sum ambulando: ut, Syre, te cum tuā Monstratione magnus perdat Juppiter, direction , Ter. Ad. 713: solers et expedita monstratio, indication, hint , Vitr. 6, 1, 12.
mōnstrātiō ōnis, f monstro, a showing, direction, guidance : tua, T. ...
An Elementary Latin Dictionary