being in effect or operation; "de facto apartheid is still operational even in the `new' African nations"- Leslie Marmon Silko; "bus service is in operation during the emergency"; "the company had several operating divisions"
of or intended for or involved in military operations
pertaining to a process or series of actions for achieving a result; "operational difficulties"; "they assumed their operational positions"
marked by qualities giving the power to produce an intended effect; "written propaganda is less efficacious than the habits and prejudices...of the readers"-Aldous Huxley; "the medicine is efficacious in stopping a cough"
an acute viral disease of the nervous system of warm-blooded animals (usually transmitted by the bite of a rabid animal); rabies is fatal if the virus reaches the brain
a perceptible indication of something not immediately apparent (as a visible clue that something has happened); "he showed signs of strain"; "they welcomed the signs of spring"
a public display of a (usually written) message; "he posted signs in all the shop windows"
a character indicating a relation between quantities; "don't forget the minus sign"
a gesture that is part of a sign language
a fundamental linguistic unit linking a signifier to that which is signified; "The bond between the signifier and the signified is arbitrary"--de Saussure
(medicine) any objective evidence of the presence of a disorder or disease; "there were no signs of asphyxiation"
be engaged by a written agreement; "He signed to play the casino on Dec. 18"; "The soprano signed to sing the new opera"
communicate in sign language; "I don't know how to sign, so I could not communicate with my deaf cousin"
mark with one's signature; write one's name (on); "She signed the letter and sent it off"; "Please sign here"
communicate silently and non-verbally by signals or signs; "He signed his disapproval with a dismissive hand gesture"; "The diner signaled the waiters to bring the menu"
place signs, as along a road; "sign an intersection"; "This road has been signed"
engage by written agreement; "They signed two new pitchers for the next season"
approve and express assent, responsibility, or obligation; "All parties ratified the peace treaty"; "Have you signed your contract yet?"
concerned with systematic structure in a particular field of study
affecting or involved in structure or construction; "the structural details of a house such as beams and joists and rafters; not ornamental elements"; "structural damage"
relating to or having or characterized by structure; "structural engineer"; "structural errors"; "structural simplicity"
relating to or caused by structure, especially political or economic structure; "structural unemployment in a technological society"