In/at a meeting

[Glizdka]

I found this post on stackexchange.com

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Both in and at get used interchangeably but they can have slightly different meanings
Use at when referring to the meeting as a location.

She is at the meeting
she is attending the meeting (we do not know what her participation is)
I will be at the conference
I will be attending the conference
​

Use in when referring to the meeting as an action.

She is in a meeting.
she is taking an active part in a meeting
I will be in the conference
I am a participant/speaker at the conference
​

When referring to participation of a meeting, using at is more passive than using in

The observer countries were at the Security Council meeting
obsever countries attended the Security Council meeting
Russia and China were in the Security Council meeting
Russia and China were a part of the Security Council meeting
​

Notice the possible difference between

She is in a meeting at the client's offices.
She is at a meeting in the client's offices.
​

they could have the exact same meaning, or the first could imply "she" is being more active whereas the second may imply "she" is attending in a supporting role.

Peter​

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It makes so much sense, but I'm not sure if I should trust it. Do you approve of this?

 

[jutfrank]

Generally yes, but the top answer (Jesse) is better.