o·vert 
(ō-vûrt, ōvûrt′)
(ō-vûrt, ōvûrt′)adj.
1. Open and observable; not hidden, concealed, or secret: overt hostility; overt intelligence gathering.
2. Of, relating to, or being military or intelligence operations sanctioned or mandated by Congress: overt aid to the rebels.
[Middle English, from Old French, past participle of ovrir, to open, from Vulgar Latin *ōperīre, alteration (influenced by Latin cōperīre, to cover) of Latin aperīre; see wer-4 in the Appendix of Indo-European roots.]
o·vertly adv.
o·vertness n.