pass·ing 
(păsĭng)
(păsĭng)adj.
1. Moving by; going past: The child waved to the passing cars.
2. Of brief duration; transitory: a passing fancy.
3. Cursory or superficial; casual: a passing glance.
4. Allowing one to pass a test, course of study, inspection, or examination; satisfactory: a passing grade.
5. Archaic Extreme or great; surpassing: "'Tis a passing shame" (Shakespeare).
adv.
Very; surpassingly: "I will mention only one particular aspect of the current mess because ... this one is surely something new and passing strange" (Walker Percy).
n.
Idiom: 1. The act of one that passes or the fact of having passed: the passing of another summer.
2. A place where or a means by which one can pass.
3. Death.
in passing
While going by; incidentally.
passing·ly adv.