pre-orderの意味・使い方・読み方 | Weblio英和辞書 In general, directories are visited two distinguishable times; in pre-order (before any of their descendants are visited) and in post-order (after all of their descendants have been visited)
order inの意味・使い方・読み方 | Weblio英和辞書 order in (三人称単数 現在形 orders in, 現在分詞 ordering in, 過去形 および 過去分詞 形 ordered in) To call and place an order for food to be delivered