Ceremony, Ritual, Equation, Style
noun, suffix
The kanji and the word are exactly the same. That means they share meanings as well.
しき
The reading is the same as what you learned with the kanji. In fact, this kanji's on'yomi AND kun'yomi are しき, so you can never go wrong.
いったい式場はどこなんだ？
Where the heck is the ceremony being held?
開会式は九時にスタートする予定です。
The opening ceremony is scheduled for 9 a.m.
この計算の式、なんかちょっとおかしくない？
Isn't there something a bit wrong with the formula for this calculation?