Definition of authentication:
earmark, stylemark, testament, hallmark, certification, ABEND, credential, AI, alpha test, mark, the color of someone's money, artificial intelligence, assay-mark, true, authoring, A-D conversion, smoking gun, trademark, background processing, testimonial, pointer, sign, suggestion, batch, certificate, access time, credentials.
- approval (part of speech: noun)
evidence (part of speech: noun)
- validation (part of speech: noun)
- authorization (part of speech: noun)