passing
1 adj A passing fashion, activity, or feeling lasts for only a short period of time and is not worth taking very seriously., (Antonym: lasting)
Hamnett does not believe environmental concern is a passing fad...
2 n-sing The passing of something such as a time or system is the fact of its coming to an end.
It was an historic day, yet its passing was not marked by the slightest excitement...
3 n-sing You can refer to someone's death as their passing, if you want to avoid using the word `death' because you think it might upset or offend people.
His passing will be mourned by many people.
4 n-sing The passing of a period of time is the fact or process of its going by.
(=passage)
The passing of time brought a sense of emptiness...
5 adj A passing mention or reference is brief and is made while you are talking or writing about something else.
(=casual)
It was just a passing comment, he didn't go on about it...
7 If you mention something in passing, you mention it briefly while you are talking or writing about something else.
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in passing phrase
(=incidentally)
The army is only mentioned in passing.