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  A table of instructions used by a controlled interface to determine what data is allowable and how the data is handled between interconnected systems.
CNSSI 4009-2015

  A collection of rules or signatures that network traffic or system activity is compared against to determine an action to take—such as forwarding or rejecting a packet, creating an alert, or allowing a system event.
NIST SP 800-115 under Ruleset

  A set of directives that govern the access control functionality of a firewall. The firewall uses these directives to determine how packets should be routed between its interfaces.
NIST SP 800-41 Rev. 1 under Ruleset