To Memorize
Hopefully you've seen 暗記 before now. It means "memorization." So, turn that into a verb and you have to memorize.
あんきする
The reading comes from 暗記. It also is the reading you learned with the kanji too.
クリステンはセーラームーンのテーマ曲の歌しを暗記している。
Kristen knows the lyrics of the Sailor Moon's theme song by heart.
明日までに、台本に書いてあるセリフを一つ残らず暗記しなければいけません。
I have to memorize every single line in the script by tomorrow.
文を丸ごと暗記する方が、単語だけを暗記するより効率がいい。
Memorizing sentences is more efficient than memorizing words by themselves.