1
general::
Phrase(s): in part
partly; to a lesser degree or extent. • I was not there, in part because of my disagreement about the purpose of the meeting. I also had a previous appointment. • I hope to win, in part because I want the prize money.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
Also, in large or small part. To some extent, not wholly, somewhat. For example, We didn't get to Chicago, in part because we didn't have time, or Jerry was the one to blame, in large part because he was the one who hired the contractor, or The attorney himself was in small part responsible for this witness. [Late 1300s]
American Heritage Idioms