A rigorous test or appraisal of the quality or worth of something.
In the 1960s, a party based around the use and advocacy of the psychedelic drug LSD ("acid").
A trust or confidence in the intentions or abilities of a person, object, or ideal from prior empirical evidence.
A conviction about abstractions, ideas, or beliefs, without empirical evidence, experience, or observation.
An obligation of loyalty or fidelity and the observance of such an obligation.
A religious or spiritual belief system.