n.[C]

1. 【音】主音
2. （演说等的）主旨，基调；（政策等的）基本方针[（+of）]
   The keynote of his speech was that we need peace.

   他发言的重点是我们需要和平。

vt.

1. 给……定基调；在（会）上作主旨发言
   The mayor will keynote the convention.

   市长将在大会上作主旨发言。

2. 给……定音
3. 把……作为主旨提出
   He keynoted the educators' worries.

   他着重谈了教育家们的忧虑。

vi.

1. 作主旨发言

n.

1. a prevailing tone or central theme.
   ▸ [as modifier] (of a speech) setting out the central theme of a conference.
2. Music  the note on which a key is based.