This is the 7977th most frequent Japanese word.
大戦
"大戦" means "great war" or "World War."
In this sentence, "大戦" is used as part of the term "第一次世界大戦" (World War I), referring specifically to a major war in history.
第一次世界大戦は多くの歴史的出来事を引き起こしました。
World War I caused many historical events.
Here, "大戦" refers generally to a major war, indicating a time period of significant conflict.
彼は大戦中に重要な役割を果たしました。
He played an important role during the great war.
The term "大戦" in this context signifies a generalized major war, emphasizing its broad consequences.