noun
Refers to the platform at a train station or bus stop where passengers board and alight. Often seen in signs or formal contexts.
乗降場で電車を待つ。
Wait for the train on the platform.
駅の乗降場には多くの人がいた。
There were many people on the station platform.
ホーム is the abbreviated form of プラットホーム, very common in everyday speech. 乗降場 is more formal and less conversational.
Compound of 乗降 (boarding and alighting) and 場 (place). The exact historical derivation is uncertain, but the term is a straightforward Sino-Japanese compound.