甲乙

Etymology 1
→ →  →  →

Compound of, with the orderings based on the ancient Chinese.

First cited with this reading to a portion of the that was completed in 757.

Noun

 * 1)  the first and second; grade A and B
 * 2)  the first two of the,  and
 * 3)  the pros and cons of something, the ups and downs, the strengths and weaknesses
 * 4)   A and B

Proper noun

 * , a medical text from the of ancient China

Etymology 2
Shift in reading of kōotsu, using the of kan for the  character.

First cited with this reading in a text from roughly 1423.

Noun

 * 1)   the high notes and low notes, the highs and lows of a piece of music