1. Something that is kept from the knowledge of others or shared only with those concerned. See STATE SECRET; TRADE SECRET.
2. Information that cannot be disclosed without a breach of trust; specif., information that is acquired in the attorney–client relationship and that either (1) the client has requested be kept private or (2) the attorney believes would be embarrassing or likely to be detrimental to the client if disclosed. • Under the ABA Code of Professional Responsibility, a lawyer cannot reveal a client’s secret unless the client consents after full disclosure. DR 4-101. Cf. CONFIDENCE(3). [Cases: Attorney and Client 32(13). C.J.S. Attorney and Client §§ 51–52.]