from
The Collaborative International Dictionary of English v.0.48
Passing \Pass"ing\, a.
1. Relating to the act of passing or going; going by, beyond,
through, or away; departing.
[1913 Webster]
2. Exceeding; surpassing, eminent. --Chaucer. "Her passing
deformity." --Shak.
[1913 Webster]
{Passing note} (Mus.), a character including a passing tone.
{Passing tone} (Mus.), a tone introduced between two other
tones, on an unaccented portion of a measure, for the sake
of smoother melody, but forming no essential part of the
harmony.
[1913 Webster]