Two related keys, a public key and a private key that are used to perform complementary operations, such as encryption and decryption or signature generation.
(FIPS 201-1, NISTIR 7298 Rev. 2)
A cryptographic key used with an asymmetric-key (public-key) algorithm. The key may be a private key or a public key.
NIST SP 800-133 under Asymmetric key