Noah Webster's New International Dictionary of the English Language
1. (v. t.) To point out; to discover; to direct to a knowledge of; to show; to make known.
2. (v. t.) To show or manifest by symptoms; to point to as the proper remedies; as, great prostration of strength indicates the use of stimulants.
3. (v. t.) To investigate the condition or power of, as of steam engine, by means of an indicator.