Decoration, Ornament
noun, suffix
This is the noun version of the kanji decorate, so it means decoration.
かざり
Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You learned this reading already so you should be able to read it!
そろそろ正月飾りの準備をしておかなくちゃ。
It's about time we started preparations for the New Year’s decorations.