One way to hold this word: something belongs to this one case and to nothing else. Nobody else has it, nobody else does it, nobody else reaches this far. From that single idea, the rest follows. What only one person does looks odd to everyone watching. What only one case reaches counts as an extreme. And what only one group owns is simply their own thing.
From the word’s history
Wiktionary gives only peculiar + -ly, so the adverb inherits whatever picture peculiar already carries: belonging to one and not to others.
packet 裡的詞源只給了一件事：peculiarly 是 peculiar 加上字尾 -ly。所以它沒有自己另外的來歷，它直接繼承 peculiar 的畫面——某樣東西專屬於某個人或某一群。這也解釋了為什麼「專屬」「奇怪」「格外」三個意思會擠在同一個字裡：它們都是同一個「唯獨這一個」在不同場合的樣子。（更早的拉丁來源不在本 packet 的證據裡，所以不在這裡下判斷。）
Wiktionary entry supplied in this packet (source_ref kaikki:3f6f69a190036ae4:1025612503:16932): 'From peculiar + -ly.'
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