n.[C]

1. 【音】主音
2. （演說等的）主旨，基調；（政策等的）基本方針[（+of）]
   The keynote of his speech was that we need peace.

   他的演說重點是我們需要和平。

vt.

1. 給……定基調；在（會）上作主旨發言
   The mayor will keynote the convention.

   市長將在大會上作主旨發言。

2. 給……定音
3. 把……作為主旨提出
   He keynoted the educators' worries.

   他著重談了教育家們的憂慮。

vi.

1. 作主旨發言

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.