One way to hold orderly: everything is standing in the place it was given, and in the turn it was given. Picture a shelf where each jar has its own spot, a line where each person keeps their own position, a job that is handed over one step at a time. Nothing here is about being clean or quiet. The question orderly answers is always the same: is the order still holding? When it holds in a set of objects, the shelf is orderly. When it holds in a group of people, the crowd is orderly. When it holds through a change over time, the handover is orderly. The noun sits a little apart: it names a person who works under orders, which is the other half of what the word order carries.
From the word’s history
The packet's Wiktionary etymology gives orderly as order plus the suffix -ly, with order coming through Middle English ordre and Old French ordne from Latin ordinem. So the word is literally order-ish: having the quality of order. That covers both halves of the modern word, because order itself means both an arrangement and a command.
依照本批資料附的 Wiktionary 詞源，orderly 就是 order 加上字尾 -ly；order 則經由中古英語 ordre、古法語 ordne，來自拉丁語 ordinem。字面意思是「帶有秩序性質的」。這個結構剛好解釋了今天的兩邊用法：因為 order 本身既是「順序、秩序」，也是「命令」，所以形容詞走了秩序那邊，名詞走了命令那邊。
Wiktionary etymology_text supplied in this packet (kaikki:3f6f69a190036ae4:708086005:25750)
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