delta
nounUK /ˈdeltə/
US /ˈdeltə/
A delta is a triangle-shaped area of land where a river splits and flows into the sea.
The Nile River forms a large delta before it reaches the Mediterranean Sea.
OTHER MEANINGS
2. The fourth letter of the Greek alphabet.
In math class, we learned that delta is the fourth letter of the Greek alphabet.
3. A small change in a value or amount.
The scientist measured a tiny delta in the temperature.
4. A triangular shape or symbol.
The pilot's badge had a small delta on it.