This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
I’m taking a one year leave of absence from university.
When Viet was a college student, he took a year of leave from school and went on a journey of self discovery.
"Do you know why Kelly has been absent from school for the past three weeks?" "Yes, apparently she has a really serious case of pink eye."