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Definitions of packet filtering:

A feature incorporated into routers to limit the flow of information based on pre-determined communications such as source, destination, or type of service being provided by the network. Packet filters let the administrator limit protocol specific traffic to one network segment, isolate email domains, and perform many other traffic control functions.
www.tecrime.com/0gloss.htm
A type of service filtering to permit or deny network traffic based on the data source, destination, service or protocol of the data packets.
www.infosec.gov.hk/english/general/glossary_oq.htm
Definition: The process of controlling access by examining packets based on the content of packet headers.
community.roxen.com/developers/idocs/rfc/rfc2647.html
A type of firewall that, although fast, has little intelligence. This reduces its effectiveness and flexibility. It is a powerful tool when used in conjunction with other types of Firewall - Stateful inspection and Application Proxy.
www.primode.com/glossary.html
A second layer of filtering on top of the standard filtering provided by a traditional transparent bridge. Can improve network performance, provide additional security, or logically segment a network to support virtual workgroups.
slis-two.lis.fsu.edu/~security/SecurityGlossary2.html
The action a device takes to selectively control the flow of data to and from a network. Packet filters allow or block packets, usually while routing them from one network to another (most often from the Internet to an internal network, and vice-versa). accomplish packet filtering, you set up a set of rules that specifiy what types of packets (those to or from a particular IP address or port) are to be allowed and what types are to be blocked.
gul.ime.usp.br/Docs/docs/howto/other-formats/html/HOWTO-INDEX-html/Security-HOWTO-12.html

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