Dedication
Offering, Presentation
noun, verbal noun, の adjective
If you dedicate your entire supply of food to the gods it's called an offering, and it takes real dedication to do something like that.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
どうして首相が靖国神社に玉串料を奉納することが批判されるのですか。
Why did the Prime Minister receive criticism for making an offering at Yasukuni Shrine?