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Definitions of PGP:
noun: (LGBT, countable) Initialism of preferred gender pronoun.
noun: (medicine, countable) Initialism of pelvic girdle pain.
noun: (encryption, software) Initialism of Pretty Good Privacy. (A program using public key encryption popularly used with email.) [(computing) software that encrypts and decrypts messages, for transmission over the Internet, using public-key cryptography]