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This is the adverb: by chance; as a coincidence. You can put it at the start of a sentence, the way people say funnily enough: Coincidentally, we were on the same train. You can also put it later: We met coincidentally, with no plan. It is a long, rather word. In casual talk, by chance or it just so happened often does the same job. It still carries the luck meaning, not merely at the same time.
碰巧；巧合地
組成From coincidental + -ly (the ending that turns an adjective into an adverb: in that way).
同家族的字
- coincidentalthe adjective this adverb is built from
- coincidencethe noun: a chance happening-together
- coincidethe verb in the same family
原始詞典資料1 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
coincidentallyadv
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In a coincidental manner.
- Near-synonyms: incidentally, happenstantially, circumstantially
- Perfect for The Railway Children, which coincidentally was first serialised in 1905 in The London Magazine, being subsequently published in book form (1906).
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。