lecture platform; pulpit; rostrum
Refers to the physical raised platform or stand from which a speaker delivers a lecture, sermon, or formal address.
教授は講壇に立って話し始めた。
The professor stood at the lecture platform and began to speak.
教会
A Bible was placed on the church pulpit.
講壇 is a platform used specifically for lectures or preaching, whereas 壇上 is the broader term for any raised speaking or ceremonial area.
academic socialism; professorial socialism
Composed of 講 (lecture, discourse) and 壇 (platform, podium). The kanji combination directly conveys the meaning of a platform for lectures or sermons.