Fence, Hedge, Wall
noun
The kanji and the word are exactly the same. That means they share meanings as well. Note that for the word fence in Japanese, フェンス is typically used. 垣 isn't very common but it's sometimes used in literature.
かき
The reading is the same as the one you learned with the kanji.
少女は心に垣をめぐらせていた。
The girl built a wall around her heart.
野生動物に畑を荒らされないように垣を造る必要があった。
It was necessary to build a hedge to prevent wild animals from destroying the fields.
城の周りに石や木で強固な垣が築かれた。
A strong fence of stone and wood was built around the castle.