Noun
an embellishing note usually written in smaller size
Source: WordNetThe fresh bok choy was more than a grace note, I call it inspired and you bloody lucky. Source: Internet
Thus, our major-theme of waiting has a grace note of joy mixed in. If you’ve seen a traditionally-colored Advent wreath, you will recognize the purple and pink colors of this season (with the central, white, Christ-candle for Christmas Eve/Day). Source: Internet