I.a.
I. Neutr., to look into the distance, look out (very rare): de vallo, Auct. B. Afr. 31.—
B. Transf., to explore: “L. Siccium prospeculatum ad locum castris capiendum mittunt,” Liv. 3, 43, 2.—*
II. Act., to look out for, watch for: “prospeculari e muris adventum imperatoris,” Liv. 33, 1, 3.