Other forms: signifies; signified; signifying
To signify means to "mean." When Paul Revere looked for the lanterns in the church tower, he knew that one would signify that the British were coming by land and two would indicate that they were coming by sea.
When objects are endowed with symbolic meaning, they are said to signify things. A dove signifies peace, a six-pointed star signifies Judaism, a frog signifies fertility, a trident signifies the Hindu Shiva or the Greek Poseidon.