This is the 4229th most frequent Japanese word.
仮設
"仮設" means "hypothesis" or "temporary construction."
In this usage, "仮設" is related to the temporary installation or setup of equipment or infrastructure.
彼は新しい機械設備の仮設について説明しました。
He explained the temporary installation of the new mechanical equipment.
In this sentence, "仮設" is used to indicate that the building is temporary or provisional in nature.
この建物は仮設のものです。
This building is a temporary one.
Here, "仮設" refers to a hypothesis or provisional theory meant to be tested or used temporarily.