Cumulative means building up gradually by adding one thing after another, like how snow accumulates on the ground during a long winter storm. Each new snowflake adds to the total, making the pile higher and higher.

When your teacher calculates your cumulative grade, she's adding together all your test scores, homework assignments, and projects from the entire semester. The effect is cumulative: every assignment contributes to your final grade.

Scientists study the cumulative effects of small actions over time. Brushing your teeth once doesn't prevent cavities, but the cumulative effect of brushing twice daily for years keeps your teeth healthy. Similarly, reading for fifteen minutes each night might not seem like much, but the cumulative result after a year means you've read dozens of books and become a much stronger reader.

Think of how a stone wall is built: one stone doesn't make a wall, but the cumulative effect of placing hundreds of stones carefully creates something strong and lasting. That's the power of cumulative effort: small, consistent actions adding up to something significant.