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"(1) A branch of computer science devoted to developing data processing systems that performs functions normally associated with human intelligence, such as reasoning, learning, and self-improvement. (2) The capability of a device to perform functions that are normally associated with human intelligence such as reasoning, learning, and self-improvement." [Definitions are from ANSI INCITS 172-220 (R2007) Information Technology -- American National Standard Dictionary of Information Technology (ANSDIT), and cited in NIST's U.S. Leadership in AI: A Plan for Federal Engagement in Developing...

"Big Data consists of extensive datasets--primarily in the characteristics of volume, variety, velocity, and/or variability--that require a scalable architecture for efficient storage, manipulation, and analysis." (SP 1500-1, Appendix A)

A biometric is "a measurable physical characteristic or personal behavioral trait used to recognize the identity, or verify the claimed identity, of an applicant. Facial images, fingerprints, and iris scan samples are all examples of biometrics." (FIPS 201)

A distributed digital ledger of cryptographically signed transactions that are grouped into blocks. Each block is cryptographically linked to the previous one after validation and undergoing a consensus decision. As new blocks are added, older blocks become more difficult to modify. New blocks are replicated across all copies of the ledger within the network, and any conflicts are resolved automatically using established rules.

Cloud computing and virtualization technologies.

Can be used to reference a wide variety of IT, engineering, mathematical, and physical complexity.