Traditional
な adjective
If 伝統 is "tradition," then adding a 的 (-al) to it would make it traditional.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
日本には伝統的な文化がたくさんあります。
Japan has a lot of traditional culture.
このお祭りは伝統的な行事ですが、今では現代的なエッセンスも加えられています。
This festival is a traditional event, but it now incorporates a modern essence as well.
着物は日本の伝統的な衣装で、褌は、伝統的な日本の男性用下着です。
Kimono are Japan’s traditional attire, and fundoshi are the traditional Japanese underwear for men.