「In order to」とは何かの目的や意図を表します。類義語には「so as to」「as a means to」「so that」「simply to」などがあります。
例：I put on music at night in order to calm down
= I put on music at night so as to calm down
= I put on music at night so that I calm down. （私は夜リラックスするために音楽をかけます。）
例：In order to understand, you may need to take notes.
= As a means to understand, you may need to take notes
= To understand, you may need to take notes. （理解するために、ノートを取る必要があるかもしれません。）