Encyclopedia, Dictionary
noun
If you come across a matter in which the rules aren’t clear, you’ll need to have a look in an encyclopedia!
じてん
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.
それ、何の事典？
What kind of encyclopedia is that?
この事典には、写真やイラストがたくさん使われています。
This encyclopedia uses a lot of photographs and illustrations.
毎年、サンタさんからクリスマスに百科事典をプレゼントしてもらっていました。
Every year, I received an encyclopedia from Santa Claus as a Christmas present.