topic
n. countablen. the main subject that you talk, write, or learn about. It is the specific thing you are focusing on in a conversation or a lesson.
n. the subject of a discourse, argument, or composition. Often used to refer to the specific matter under discussion or investigation.
The main topic of the meeting is the new budget.
The teacher asked the students to choose a research topic that they felt passionate about for their final project.
While the broad theme of the conference was sustainability, each speaker addressed a specific topic ranging from renewable energy to waste management strategies.
From Latin topica, from Ancient Greek τοπικός (topikós, “pertaining to a place, local, pertaining to a common place, or topic, topical”), from τόπος (tópos, “a place”).
Commonly paired with the prepositions 'on' or 'of' when introducing the subject matter.