To show; to point out; to discover; to direct the mind to a knowledge of something not seen, or something that will probably occur in future. Thus, fermentation indicates a certain degree of heat in a liquor. A heavy swell of the sea in calm weather often indicates a storm at a distance. A particular kind of cloud in the west at evening, indicates the approach of rain.

To tell; to disclose.

In medicine, to show or manifest by symptoms; to point to as the proper remedies; as, great prostration of strength indicates the use of stimulants.