Open and observable; not hidden, concealed, or secret: overt hostility; overt intelligence gathering.
Of, relating to, or being military or intelligence operations sanctioned or mandated by Congress: overt aid to the rebels.
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.