有序
yoǔ xù · HSK 7
in order
📚 有序 = 有 have + 序 order = having order, so orderly
有 means have and 序 means sequence or order (as in 顺序). Put them together and something that has order is regular and in-order. 序 also shows up in 序号 meaning serial number.
有 — hand 𠂇 + moon/meat 月
Originally depicted a hand holding a piece of meat (月 here is the 'meat' radical, not moon), expressing the idea of possessing something. Over time the meaning broadened from 'to hold/possess' to the general sense of 'to have' or 'there is/exists'.
序 — 广 radical (shelter) + 予 (give/I)
Originally depicted the side walls or wings of a building under the 广 (shelter) radical, with 予 serving as the phonetic component. From 'side wall' it extended to mean 'sequence' or 'order,' as walls were arranged in succession. Today it commonly means 'order,' 'sequence,' or 'preface.'