pray, wish
祈る（いのる）、祈り（いのり）、祈願（きがん）
to pray, prayer, prayer
On-reading (キ) is used in compounds; kun-reading (いの(る)) is used standalone or with okurigana. Appears in many compounds — memorize the key ones rather than the kanji in isolation. This kanji forms verbs/adjectives with okurigana. Practice both the word form and compound forms.
From the JLP Quiz question bank — the word in the form it is actually tested in.
世界の平和が永続することを、祈っ___。
Answer: てやまない
「祈」の音読みは？
Answer: き
家族や友達と一緒に行くことが多く、新しい年の健康や幸福を祈ります。
Answer: 新年に神社やお寺にお参りに行くこと
