A group committed to traditional ideas or practices: a diplomat of the old school. (noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "old school" in a sentence
"The DJ is playing a sizzling, old school Lillo Thomas hit that I remember vividly because Keith and I once had a picnic and he played it on his boom box."
"He was, Andrew Card, Bushs chief of staff, observed, a little bit old school and a little bit sexist in his dealings with her."
"Some of the kids at my old school called me ‘Gooey Louie.’"