This is the 727th most frequent Japanese word.
変化
"Change" or "transformation."
Here, "変化" refers to the transition or changes occurring in the seasons.
季節の変化を感じることができます。
You can feel the change of seasons.
In this sentence, "変化" is used to mean adjustments or modifications needed.
その計画には少し変化が必要です。
That plan requires some changes.
"変化" here refers to the larger implications and alterations caused by progress, stressing societal transformation.