| 1. | going by or past; elapsing: He was feeling better with each passing day. |
| 2. | brief, fleeting, or fortuitous; transitory: to take a passing fancy to something. |
| 3. | done, given, etc., in passing; cursory: a passing mention. |
| 4. | surpassing, preeminent, or extreme. |
| 5. | indicating satisfactory performance in a course, on a paper, in a test, etc.: a passing grade on a test. |
| 6. | surpassingly; exceedingly; very. |
| 7. | the act of a person or thing that passes or causes something to pass. |
| 8. | a means or place of passage. |
| 9. | in passing, by the way; incidentally: The speaker mentioned his latest book in passing. |
in passing
Incidentally, by the way, as in "It may be remarked in passing" (Charlotte Brontë, Shirley, 1849). [Mid-1800s]