WASHINGTON — In just a few comments during a question-and-answer session this week at the Conservative Political Action Conference, Stephen K. Bannon named many of the concepts that, though unfamiliar to many Americans, have animated his tenure as the president’s chief strategist.

Ideas like “economic nationalism” and “corporatist media” have become central to the ideology that Mr. Bannon has carried to the White House from his time running Breitbart News.

Daniel Kreiss, a University of North Carolina professor who studies political language, said Mr. Bannon’s phrases emerge from “a very defined cultural and ideological movement” that has grown out of populist online communities like Breitbart.

That vernacular, he said, is used to articulate a “very coherent story about what America is, and what it should be, that is not reducible to a set of policy positions” — but only if you know how to hear it.