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In unison means everyone doing or saying the same thing at exactly the same time. A class answering 'yes!' together, all at once, is answering in unison. In music, singing 'in unison' means everyone sings the exact same note or melody together — not different notes that blend (that would be 'harmony'), but literally the same sound from every voice.
異口同聲、齊聲；（音樂）齊唱同音
原始詞典資料6 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。
UNISONname/ˈjunɪsən/
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A public-sector trade union in the United Kingdom.
unisonnoun/ˈjunɪsən/
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entertainmentlifestylemusicIdentical pitch between two notes or sounds; the simultaneous playing of notes of identical pitch (or separated by one or more octaves).
- The unison has a pitch ratio of 1:1.
- The young principal timpanist, Timothy Genis, was superb throughout, though his sidekick timpanist sometimes lagged in the final unisons.
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entertainmentlifestylemusicA sound or note having the same pitch as another, especially when used as the base note for an interval; a unison string.
- I could not behold him without emotion; when he accosted me, his well-known voice made my heart vibrate, like a musical chord, when its unison is struck.
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The state of being in harmony or agreement; harmonious agreement or togetherness, synchronisation.
- Everyone moved in unison, but the sudden change in weight distribution capsized the boat.
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Two or more voices speaking or singing the same words together.
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。