Integrity
As a quality attribute, integrity is the degree to which a system prevents unauthorized access to, or modification of, its programs or data. ISO/IEC 25010 classifies it as a sub-characteristic of security, alongside confidentiality and non-repudiation, and it is the "I" in the CIA triad.
Integrity is achieved by controls such as access restrictions and cryptographic techniques like digital signatures, which let a system detect whether data or code has been tampered with.
This security sense is narrower than data integrity, which also covers accidental corruption and logical validity, not just unauthorized modification.
A related, behavioral sense of integrity concerns whether a system behaves coherently and reproducibly, whether clients get identical results for identical queries, which overlaps with consistency rather than with security.
The term is therefore context-dependent. Which definition applies depends on whether the conversation is about protecting data from an attacker or about a system behaving predictably.