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adj.
happening or arising or located within some limits or especially surface; "internal organs"; "internal mechanism of a toy"; "internal party maneuvering"
adj.
serving as an essential component; "a cardinal rule"; "the central cause of the problem"; "an example that was fundamental to the argument"; "computers are fundamental to modern industrial structure"
adj.
being of crucial importance; "a pivotal event"; "Its pivotal location has also exposed it to periodic invasions"- Henry Kissinger; "the polar events of this study"; "a polar principal"
adj.
national; especially in reference to the government of the United States as distinct from that of its member units; "the Federal Bureau of Investigation"; "federal courts"; "the federal highway program"; "federal property"