dictionary day three: signal

signal n & v - n 1a a usuually prearranged sign conveying information, guidance, etc esp at a distance. b a message made up of such signs 2 an immediate occasion or cause of movement, action, etc 3 electri a an electrical impulse or impulses or radio waves transmitted as a signal b a sequence of these 4 a light, semaphore etc on a railway giving instructions or warning to train-drivers etc 5 bridge a prearranged mode of bidding or play to convey information to one's partner v 1 make signals 2a make signals to, direct b transmit by signal, announce

after two days of essays, something that needs no explanation...