In the sentence "Although the committee planned a harmonic meeting, dissention could be heard in the room", "committee" acts as the subject of the sentence.
Here's why:
* Subject: The subject is the person or thing performing the action of the verb. In this case, the committee is the one planning the meeting.
* Verb: The verb is the action word, which is "planned" in this sentence.
Therefore, "committee" is a noun functioning as the subject of the sentence.